Honour SOURCE_DATE_EPOCH for VERSION default

Merged upstream as cd3f1024a37a332f1d4fa96a817ca80dfa2a478c, but not yet in a
release. GitHub PR: https://github.com/kichik/nsis/pull/13

Python snippet from: https://reproducible-builds.org/docs/source-date-epoch/#python


diff --git a/SConstruct b/SConstruct
index e8252c9..41786f2 100755
--- a/SConstruct
+++ b/SConstruct
@@ -95,8 +95,8 @@ default_doctype = 'html'
 if defenv.WhereIs('hhc', os.environ['PATH']):
 	default_doctype = 'chm'
 
-from time import strftime, gmtime
-cvs_version = strftime('%d-%b-%Y.cvs', gmtime())
+import time
+cvs_version = time.strftime('%d-%b-%Y.cvs', time.gmtime(int(os.environ.get('SOURCE_DATE_EPOCH', time.time()))))
 
 opts = Variables()
 
is.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>
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<tr><td><span title='2022-05-22 02:00:10 +0200'>2022-05-22</span></td><td><a href='/guix/commit/gnu/packages/cybersecurity.scm?id=39033592a819893a067fc699c3c35f3e544c5c99'>gnu: ropgadget: Use HTTPS home page.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/cybersecurity.scm (ropgadget)[home-page]: Use HTTPS.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2022-01-14 09:54:56 +0100'>2022-01-14</span></td><td><a href='/guix/commit/gnu/packages/cybersecurity.scm?id=be2c199661039422b9c9832b54b3569bef8dbe2f'>gnu: Add blacksmith.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/cybersecurity.scm (blacksmith): New variable.

Signed-off-by: Nicolas Goaziou &lt;mail@nicolasgoaziou.fr&gt;
</span></span></td><td>Raghav Gururajan via Guix-patches via</td></tr>