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`
ges/specifications.scm?id=dc09170a54cefc876bd63f45c44de39356b84dc0'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/specifications.scm'>
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<div class='path'>path: <a href='/guix/log/?id=dc09170a54cefc876bd63f45c44de39356b84dc0&amp;showmsg=1'>root</a>/<a href='/guix/log/gnu?id=dc09170a54cefc876bd63f45c44de39356b84dc0&amp;showmsg=1'>gnu</a>/<a href='/guix/log/gnu/packages?id=dc09170a54cefc876bd63f45c44de39356b84dc0&amp;showmsg=1'>packages</a>/<a href='/guix/log/gnu/packages/specifications.scm?id=dc09170a54cefc876bd63f45c44de39356b84dc0&amp;showmsg=1'>specifications.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/specifications.scm?id=dc09170a54cefc876bd63f45c44de39356b84dc0'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2024-06-30 10:11:20 +0100'>2024-06-30</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/specifications.scm?id=2541171580395bc14010e5ad136c321d34077ce3'>gnu: Add specification-specreduce-data.</a></td><td>Sharlatan Hellseher</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/specifications.scm (specification-specreduce-data): New variable.

Change-Id: I269cc7eefa12dd8d207da9ac613b5793c3e24c7c


</td></tr>
<tr class='logheader'><td><span title='2024-05-23 15:55:55 +0100'>2024-05-23</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/specifications.scm?id=016fd7720db06f0945e345cc9d5043642f3b8720'>gnu: Add specification-ipld.</a></td><td>Sharlatan Hellseher</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/specifications.scm (specification-ipld): New variable.

Change-Id: Ib36d0cdb4a6d20da789ba20830945c8a7d223b69


</td></tr>
<tr class='logheader'><td><span title='2024-04-12 16:58:42 +0100'>2024-04-12</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/specifications.scm?id=4d7a2c860eb000fe12c93f62a7467b4e5eec58ff'>gnu: Add specification-multicodec.</a></td><td>Artyom V. Poptsov</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/specifications.scm (specification-multicodec): New variable.

Change-Id: I75de43613c5a1818b1db79aa275c58dc52411957
Signed-off-by: Sharlatan Hellseher &lt;sharlatanus@gmail.com&gt;


</td></tr>
<tr class='logheader'><td><span title='2024-04-12 16:58:42 +0100'>2024-04-12</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/specifications.scm?id=e74b59109176966a012ad7e1586ad4c829454ecc'>gnu: Add specification-multihash.</a></td><td>Artyom V. Poptsov</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/specifications.scm (specification-multihash): New variable.

Change-Id: I065898164cc126445a92b33dd628ab06e19d0615
Signed-off-by: Sharlatan Hellseher &lt;sharlatanus@gmail.com&gt;


</td></tr>
<tr class='logheader'><td><span title='2024-04-06 21:39:12 +0100'>2024-04-06</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/specifications.scm?id=d4686ff6117c49d1181152820753f978fae5734d'>gnu: Add specification-multibase.</a></td><td>Artyom V. Poptsov</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/specifications.scm: New module.
  (specification-multibase): New variable.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add "gnu/packages/specifications.scm".

Change-Id: I5994e8f8927d5365cc201da30bd49abf03d17574
Signed-off-by: Sharlatan Hellseher &lt;sharlatanus@gmail.com&gt;


</td></tr>