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()
 
ption 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='2023-03-02 10:55:08 +0000'>2023-03-02</span></td><td><a href='/guix/commit/gnu/packages/gd.scm?id=7df09ee0ab3e7962ef27859ce87e06a323059284'>Merge remote-tracking branch 'savannah/master' into core-updates</a><span class='msg-avail'>...<span class='msg-tooltip'>Conflicts:
	gnu/local.mk
	gnu/packages/autotools.scm
	gnu/packages/cmake.scm
	gnu/packages/gnuzilla.scm
	gnu/packages/haskell.scm
	gnu/packages/pdf.scm
	gnu/packages/python-xyz.scm
	gnu/packages/samba.scm
	gnu/packages/tex.scm
	gnu/packages/tls.scm
	gnu/packages/wxwidgets.scm
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2023-02-25 00:00:32 +0100'>2023-02-25</span></td><td><a href='/guix/commit/gnu/packages/gd.scm?id=5c4240442cd39fd5d279e080184f0ee2fb1c8af4'>gnu: perl-gd: Use gexps.</a><span class='msg-avail'>...<span class='msg-tooltip'>This helps cross-compilation: in that case, '%build-inputs' was unbound.

* gnu/packages/gd.scm (perl-gd)[arguments]: Rewrite using gexps.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-02-25 00:00:32 +0100'>2023-02-25</span></td><td><a href='/guix/commit/gnu/packages/gd.scm?id=279b0122b63502f1d5ea027025dcc4dd4180e478'>gnu: perl-gd: Remove input labels.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gd.scm (perl-gd)[inputs]: Remove labels.
</span></span></td><td>Ludovic Courtès</td></tr>