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__
cgit logo'/></a></td>
<td class='main'><a href='/'>index</a> : <a href='/guix/'>guix</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='43395dd244f38001e5ff7eed28e1a8499a451de3'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=43395dd244f38001e5ff7eed28e1a8499a451de3'>refs</a><a class='active' href='/guix/log/gnu/packages/rush.scm'>log</a><a href='/guix/tree/gnu/packages/rush.scm?id=43395dd244f38001e5ff7eed28e1a8499a451de3'>tree</a><a href='/guix/commit/gnu/packages/rush.scm?id=43395dd244f38001e5ff7eed28e1a8499a451de3'>commit</a><a href='/guix/diff/gnu/packages/rush.scm?id=43395dd244f38001e5ff7eed28e1a8499a451de3'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/rush.scm'>
<input type='hidden' name='id' value='43395dd244f38001e5ff7eed28e1a8499a451de3'/><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=43395dd244f38001e5ff7eed28e1a8499a451de3'>root</a>/<a href='/guix/log/gnu?id=43395dd244f38001e5ff7eed28e1a8499a451de3'>gnu</a>/<a href='/guix/log/gnu/packages?id=43395dd244f38001e5ff7eed28e1a8499a451de3'>packages</a>/<a href='/guix/log/gnu/packages/rush.scm?id=43395dd244f38001e5ff7eed28e1a8499a451de3'>rush.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/rush.scm?id=43395dd244f38001e5ff7eed28e1a8499a451de3&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-08-14 10:58:54 +0100'>2024-08-14</span></td><td><a href='/guix/commit/gnu/packages/rush.scm?id=4e809f692c637ecdbea1f1dfc94d0bdcabb21491'>gnu: rush: Update to 2.4.</a><span class='msg-avail'>...</span></td><td>Andy Tai</td></tr>