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`
et' action='/guix/log/gnu/packages/gawk.scm'>
<input type='hidden' name='id' value='accb5c310001339bb4956632db89b1654c6431f1'/><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=accb5c310001339bb4956632db89b1654c6431f1'>root</a>/<a href='/guix/log/gnu?id=accb5c310001339bb4956632db89b1654c6431f1'>gnu</a>/<a href='/guix/log/gnu/packages?id=accb5c310001339bb4956632db89b1654c6431f1'>packages</a>/<a href='/guix/log/gnu/packages/gawk.scm?id=accb5c310001339bb4956632db89b1654c6431f1'>gawk.scm</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/gnu/packages/gawk.scm?id=accb5c310001339bb4956632db89b1654c6431f1&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-03-23 04:41:51 -0400'>2018-03-23</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=dcd5ea699fe4f7e8c1f53933e4d0e027c1a0a512'>gnu: gawk: Return #t from all phases.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gawk.scm (gawk)[arguments]: Return #t from
the 'set-shell-file-name' phase.
</span></span></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2018-03-14 19:12:06 +0200'>2018-03-14</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=7c4a0f975b587d0c2718b80ba5c2fa7b8cc8f2ec'>gnu: gawk: Enable parallel tests.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gawk.scm (gawk)[arguments]: Enable parallel tests.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-03-14 19:12:06 +0200'>2018-03-14</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=3ba42b8566704c588f8d76828f960575c6fc0f53'>gnu: gawk: Update to 4.2.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gawk.scm (gawk): Update to 4.2.1.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2017-12-10 23:00:42 +0200'>2017-12-10</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=173c6ec8a391dee9d7b38a20370e48a4a05288d0'>Revert "gnu: gawk: Update to 4.2.0."</a><span class='msg-avail'>...<span class='msg-tooltip'>This reverts commit 78cd051eef9e25a6993478619d2bdb2db60565a6.

This commit was added past the merge window and caused conflicts with
gettext's test suite.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2017-12-10 11:21:43 +0200'>2017-12-10</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=78cd051eef9e25a6993478619d2bdb2db60565a6'>gnu: gawk: Update to 4.2.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gawk.scm (gawk): Update to 4.2.0.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2017-03-30 22:59:53 +0200'>2017-03-30</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=84157bb8bf2c610584e0836047da4c710f8eaf76'>Merge branch 'master' into core-updates</a><span class='msg-avail'>...<span class='msg-tooltip'>Most conflicts are from 6fd52309b8f52c9bb59fccffac53e029ce94b698.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-03-30 01:30:16 +0200'>2017-03-30</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=6fd52309b8f52c9bb59fccffac53e029ce94b698'>gnu: Use HTTPS for almost all gnu.org HOME-PAGEs.</a><span class='msg-avail'>...<span class='msg-tooltip'>All HTTP gnu.org (and supported subdomain) HOME-PAGEs changed to HTTPS.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>