Don't encode the current timestamp.

This affects the output of `perl -V`, specifically the message "Compiled
at [...]".

The 'cf_time' and 'cf_by' values show up in 'config.h' and
in 'Config_heavy.pl'.

Use the output of 'uname -s' instead of 'uname -a' to avoid recording
the kernel version ('uname -o' leads to directory names like
'x86_64-gnulinux' instead of 'x86_64-linux', which might cause breakage
down the road.)

diff --git a/perl.c b/perl.c
index 228a0d8..ed38313 100644
--- a/perl.c
+++ b/perl.c
@@ -1825,6 +1825,7 @@ S_Internals_V(pTHX_ CV *cv)
     PUSHs(Perl_newSVpvn_flags(aTHX_ non_bincompat_options,
 			      sizeof(non_bincompat_options) - 1, SVs_TEMP));
 
+#define PERL_BUILD_DATE "Jan  1 1970 00:00:00"
 #ifndef PERL_BUILD_DATE
 #  ifdef __DATE__
 #    ifdef __TIME__

--- a/Configure	1970-01-01 01:00:00.000000000 +0100
+++ b/Configure	2016-10-01 14:47:20.017319739 +0200
@@ -3276,7 +3276,7 @@ $eunicefix tr
 : Try to determine whether config.sh was made on this system
 case "$config_sh" in
 '')
-myuname=`$uname -a 2>/dev/null`
+myuname=`$uname -s 2>/dev/null`
 $test -z "$myuname" && myuname=`hostname 2>/dev/null`
 # Downcase everything to avoid ambiguity.
 # Remove slashes and single quotes so we can use parts of this in
@@ -3845,10 +3845,10 @@
 . ./posthint.sh
 
 : who configured the system
-cf_time=`LC_ALL=C; LANGUAGE=C; export LC_ALL; export LANGUAGE; $date 2>&1`
+cf_time="1970-01-01"
 case "$cf_by" in
 "")
-	cf_by=`(logname) 2>/dev/null`
+	cf_by="guix"
 	case "$cf_by" in
 	"")
 		cf_by=`(whoami) 2>/dev/null`
2db3c54bc1956892c3be77d563'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=1da863cc3bbb212db3c54bc1956892c3be77d563'>root</a>/<a href='/guix/log/etc?id=1da863cc3bbb212db3c54bc1956892c3be77d563'>etc</a>/<a href='/guix/log/etc/git?id=1da863cc3bbb212db3c54bc1956892c3be77d563'>git</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/etc/git?id=1da863cc3bbb212db3c54bc1956892c3be77d563&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-11-07 12:33:25 -0500'>2023-11-07</span></td><td><a href='/guix/commit/etc/git?id=889a6204f871fa47ba1ce12bf4a5e9600576f86a'>doc: Add some guidelines for reviewing.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/contributing.texi (Contributing) [Reviewing the Work of Others]: New
section.
(Debbugs Usertags): Expound with Emacs Debbugs information and document the
'reviewed-looks-good' usertag.
* etc/git/gitconfig [b4]: New section.

Change-Id: I56630b15ec4fbc5c67e5420dbf2838556a005d6b
Reviewed-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2023-10-22 16:09:04 -0400'>2023-10-22</span></td><td><a href='/guix/commit/etc/git?id=8005e09b261d65bf0f7469cd8e89423c1c1db820'>build: Add a commit-msg hook that embeds Change-Id in commit messages.</a><span class='msg-avail'>...<span class='msg-tooltip'>Partially implements &lt;https://issues.guix.gnu.org/66027&gt;.

This will make it possible to track a merged commit back to its original
posting on the mailing list, and open the door to new opportunities such as
closing fully merged series automatically.

* Makefile.am (COMMIT_MSG_MAGIC): New variable.
(.git/hooks/commit-msg): New target.
* etc/git/commit-msg: New file.
* doc/contributing.texi (Configuring Git): Document Change-Id.

Series-changes: 3
 - Clarify documentation text, as suggested by Simon
Change-Id: Ia92fa958eae600fdd4e180bad494c85db8bb4dd6
Reviewed-by: Simon Tournier &lt;zimon.toutoune@gmail.com&gt;
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2023-05-18 23:17:31 -0400'>2023-05-18</span></td><td><a href='/guix/commit/etc/git?id=03b453cfe54756bcec6b7c7dfaf71566d84c7a75'>etc: gitconfig: Do not enforced signed commits.</a><span class='msg-avail'>...<span class='msg-tooltip'>This change was more invasive than initially thought, and cannot be disabled
easily, as raised by a few people.  Let's revert it for now.  At least the
pre-push hook should be deployed automatically and catch any unsigned commits
attempted to be pushed to Savannah.

* etc/git/gitconfig [commit]: Remove section.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2023-05-01 12:39:11 -0400'>2023-05-01</span></td><td><a href='/guix/commit/etc/git?id=8b972da068708a8b17f3ab153ea940690ca49ca9'>Makefile.am: Auto-configure Git on 'make'.</a><span class='msg-avail'>...<span class='msg-tooltip'>This means we do not need to worry anymore about manually syncing the pre-push
git hook or the Guix-provided git configuration.

* etc/git/gitconfig: Augment configuration template with useful options to
allow for auto-configuration.
* Makefile.am (.git/hooks/pre-push, .git/config): New targets.
(nodist_noinst_DATA): New primary variable holding the above targets.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-10-14 00:24:34 +0200'>2021-10-14</span></td><td><a href='/guix/commit/etc/git?id=f8b10932c86cf4c1657a67e8c484d76f757b64bd'>Add git configuration templates to improve diff hunk header detection.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a follow-up to commit 9fc8ae4171e5da4939a64fc6d684c8b9d85bbe84, which
missed two hunks from &lt;https://issues.guix.gnu.org/50363&gt;.

Reported by hackeryarn on #guix.

* .gitattributes, etc/git/gitconfig: New files.

Signed-off-by: Marius Bakke &lt;marius@gnu.org&gt;
</span></span></td><td>Sarah Morgensen</td></tr>
<tr><td><span title='2020-12-14 12:15:06 -0500'>2020-12-14</span></td><td><a href='/guix/commit/etc/git?id=80ebcdd100a82fdc582e62f35042c74ce38ea753'>maint: Only run `make authenticate` when pushing commits.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/git/pre-push: Exit early when deleting a branch.
</span></span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2020-06-01 00:51:38 +0200'>2020-06-01</span></td><td><a href='/guix/commit/etc/git?id=6f6758c45d3913dbf98bb8e50f21f7bfb25b40ea'>maint: Adjust comment in 'pre-push' hook.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/git/pre-push: Adjust comment.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-05-29 18:31:38 +0200'>2020-05-29</span></td><td><a href='/guix/commit/etc/git?id=e65a44649e8d7698c4a888f1de625a67052520e9'>maint: Git pre-push hook runs "make authenticate check-channel-news".</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/git/pre-push: Change to run "make authenticate check-channel-news".
</span></span></td><td>Ludovic Courtès</td></tr>