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><td><span title='2021-09-18 19:37:44 +0200'>2021-09-18</span></td><td><a href='/guix/commit/tests/opam.scm?id=358ad74f41a59b177c9961abf49753a7ce3f41a0'>tests: Allow opam test to run without networking.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-08-21 00:05:21 +0200'>2021-08-21</span></td><td><a href='/guix/commit/tests/opam.scm?id=fc29c80b9635ff490bcc768c774442043cb1e231'>guix: opam: More flexibility in the importer.</a><span class='msg-avail'>...</span></td><td>Alice BRENON</td></tr>
<tr><td><span title='2021-05-28 11:36:03 +0200'>2021-05-28</span></td><td><a href='/guix/commit/tests/opam.scm?id=3f5bc6cbb34e1b57829ce3bf482310c49f03d3c3'>import: opam: Generate license for package.</a><span class='msg-avail'>...</span></td><td>Xinglu Chen</td></tr>
<tr><td><span title='2020-12-08 22:58:37 +0100'>2020-12-08</span></td><td><a href='/guix/commit/tests/opam.scm?id=799f066768bacb321ebad84c75b2bbfd269e7cd8'>import: opam: Adjust test to latest 'opam-&gt;guix-package' changes.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-12-08 16:40:30 +0100'>2020-12-08</span></td><td><a href='/guix/commit/tests/opam.scm?id=15ee1b8317adeb74938f3bb7f0c7cb635a818292'>guix: opam: Pass default repository to recursive importer.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2020-10-02 00:44:14 +0200'>2020-10-02</span></td><td><a href='/guix/commit/tests/opam.scm?id=23dc21f05b54ef63daaea9eb301cfddbc4c82ddb'>tests: opam: Test additional syntax.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2020-10-02 00:30:23 +0200'>2020-10-02</span></td><td><a href='/guix/commit/tests/opam.scm?id=ad05537e32173403d034a0d552092f566abd05a5'>tests: opam: Factorize tests.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2020-01-17 14:22:07 +0100'>2020-01-17</span></td><td><a href='/guix/commit/tests/opam.scm?id=282f91790a5bbd0d9b3223c4bfd45b66e418c200'>import: opam: Avoid uses of '@@' in tests.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-07 22:25:14 +0200'>2019-09-07</span></td><td><a href='/guix/commit/tests/opam.scm?id=1d03a9198db6f3656a34d62eb89e5f7d5a99e76a'>tests: opam: Fix input type in import test.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-02-05 22:33:06 +0100'>2019-02-05</span></td><td><a href='/guix/commit/tests/opam.scm?id=0f4432c620f8d569ef29ca74bad2b7eebd803441'>import: opam: Fix conditions.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>