Lookup gzdoom pk3 files in the installed directory in
addition to the path that is stored in ~/.config/gzdoom/.

Simply replacing the hardcoded /usr/share would leave the
configfile pointing to outdated guix builds, which could get
garbage collected and break the gzdoom installation.
This ensures that the files installed with the corresponding
build will be used.

--- /src/d_main.cpp	2018-01-16 22:13:09.700602781 +0200
+++ /src/d_main.cpp	2018-01-16 22:22:36.560617961 +0200
@@ -1716,6 +1716,11 @@
 		return wad;
 	}
 
+    mysnprintf (wad, countof(wad), "%s/%s", GUIX_OUT_PK3, file);
+    if (DirEntryExists (wad)) {
+        return wad;
+    }
+
 	if (GameConfig != NULL && GameConfig->SetSection ("FileSearch.Directories"))
 	{
 		const char *key;
ion value='koszko-scripts'>koszko-scripts</option>
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<div class='path'>path: <a href='/guix/log/?id=6b1375d3afdd81d58ba243cdbd75d86855054271'>root</a>/<a href='/guix/log/tests?id=6b1375d3afdd81d58ba243cdbd75d86855054271'>tests</a>/<a href='/guix/log/tests/pypi.scm?id=6b1375d3afdd81d58ba243cdbd75d86855054271'>pypi.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/tests/pypi.scm?id=6b1375d3afdd81d58ba243cdbd75d86855054271&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-11-11 00:14:30 +0100'>2021-11-11</span></td><td><a href='/guix/commit/tests/pypi.scm?id=b20cd80ff1f3c9eb988a0cc27ed9538b68914608'>import: pypi: Allow imports of a specific version.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-09-30 23:44:49 +0200'>2021-09-30</span></td><td><a href='/guix/commit/tests/pypi.scm?id=7b75f90c5b0da896c486cae23d19d43e2a03bb56'>import: pypi: Honor the 'upstream-name' package property.</a><span class='msg-avail'>...</span></td><td>Xinglu Chen</td></tr>
<tr><td><span title='2020-07-25 19:11:36 +0200'>2020-07-25</span></td><td><a href='/guix/commit/tests/pypi.scm?id=6a79eed920fd4914b162461553a8d7e8f5eee324'>utils: Remove compatibility re-export of 'memoize'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-04-27 23:29:40 +0200'>2020-04-27</span></td><td><a href='/guix/commit/tests/pypi.scm?id=5dfe02c60767a633c67f7f6fc9557b54b3c99b63'>tests: Remove trailing commas in JSON tests.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-12 11:52:37 +0100'>2020-03-12</span></td><td><a href='/guix/commit/tests/pypi.scm?id=7657e61d6b33fe758fd69355ed53efbd5310743c'>import: pypi: Rewrite to use 'define-json-mapping'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>