Always provide the same date and time in 'Py_GetBuildInfo'.
This is the information shown at the REPL and in 'sys.version'.
We cannot pass it in CPPFLAGS due to whitespace in the DATE string.

--- a/Modules/getbuildinfo.c
+++ b/Modules/getbuildinfo.c
@@ -4,6 +4,10 @@
 #include <stdio.h>
 #endif
 
+/* Deterministic date and time.  */
+#define DATE "Jan  1 1970"
+#define TIME "00:00:01"
+
 #ifndef DATE
 #ifdef __DATE__
 #define DATE __DATE__
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<tr><th>author</th><td>Philip McGrath &lt;philip@philipmcgrath.com&gt;</td><td class='right'>2022-07-25 08:16:30 -0400</td></tr>
<tr><th>committer</th><td>Ludovic Courtès &lt;ludo@gnu.org&gt;</td><td class='right'>2022-08-04 12:05:52 +0200</td></tr>
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<tr><th>parent</th><td colspan='2' class='oid'><a href='/guix/commit/tests/monads.scm?id=8d4670f4d18a9c57a6300eb3c11fbc26825f7a61'>8d4670f4d18a9c57a6300eb3c11fbc26825f7a61</a> (<a href='/guix/diff/tests/monads.scm?id=3b017b9400978a7f351fd8a75e33d1eefb079d08&amp;id2=8d4670f4d18a9c57a6300eb3c11fbc26825f7a61'>diff</a>)</td></tr><tr><th>download</th><td colspan='2' class='oid'><a href='/guix/snapshot/guix-3b017b9400978a7f351fd8a75e33d1eefb079d08.tar.gz'>guix-3b017b9400978a7f351fd8a75e33d1eefb079d08.tar.gz</a><br/><a href='/guix/snapshot/guix-3b017b9400978a7f351fd8a75e33d1eefb079d08.zip'>guix-3b017b9400978a7f351fd8a75e33d1eefb079d08.zip</a><br/></td></tr></table>
<div class='commit-subject'>gnu: Add ruby-anystyle.</div><div class='commit-msg'>* gnu/packages/ruby.scm (ruby-anystyle): New variable.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
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