disk_cache_create() here looks up the users home directory from <pwd.h>
which resolves to "/" in the build environment. I could not find an easy
way to set the home directory to something else, so we disable this test
for now.

--- a/src/compiler/glsl/tests/cache_test.c
+++ b/src/compiler/glsl/tests/cache_test.c
@@ -170,11 +170,6 @@
    unsetenv("MESA_GLSL_CACHE_DIR");
    unsetenv("XDG_CACHE_HOME");
 
-   cache = disk_cache_create("test", "make_check", 0);
-   expect_non_null(cache, "disk_cache_create with no environment variables");
-
-   disk_cache_destroy(cache);
-
    /* Test with XDG_CACHE_HOME set */
    setenv("XDG_CACHE_HOME", CACHE_TEST_TMP "/xdg-cache-home", 1);
    cache = disk_cache_create("test", "make_check", 0);
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<div class='path'>path: <a href='/guix/log/?id=65c110e27a8ce3889d0efecc36b43316265a2d8a'>root</a>/<a href='/guix/log/tests?id=65c110e27a8ce3889d0efecc36b43316265a2d8a'>tests</a>/<a href='/guix/log/tests/gem.scm?id=65c110e27a8ce3889d0efecc36b43316265a2d8a'>gem.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/gem.scm?id=65c110e27a8ce3889d0efecc36b43316265a2d8a&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-04-27 23:29:40 +0200'>2020-04-27</span></td><td><a href='/guix/commit/tests/gem.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='2020-02-05 16:18:58 +0100'>2020-02-05</span></td><td><a href='/guix/commit/tests/gem.scm?id=c24fe4a52057ea3390faf59fd672a617eff34aea'>import: gem: Deal with unavailable licensing info.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-12-11 12:13:03 +0100'>2019-12-11</span></td><td><a href='/guix/commit/tests/gem.scm?id=70a8e13277d4a44b89dd9ee2290b98105f0235f1'>import: utils: 'recursive-import' returns a list rather than a stream.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-12-11 12:12:58 +0100'>2019-12-11</span></td><td><a href='/guix/commit/tests/gem.scm?id=ddd59159004ca73c9449a27945116ff5069c3743'>import: utils: 'recursive-import' returns packages in topological order.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-09-04 17:25:11 +0200'>2018-09-04</span></td><td><a href='/guix/commit/tests/gem.scm?id=ca719424455465fca4b872c371daf2a46de88b33'>Switch to Guile-Gcrypt.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-07-11 07:08:54 +0300'>2018-07-11</span></td><td><a href='/guix/commit/tests/gem.scm?id=88388766f778d344699e7a8a0a4d970c403007e3'>import: gem: Add recursive import.</a><span class='msg-avail'>...</span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2017-02-13 16:04:09 +0100'>2017-02-13</span></td><td><a href='/guix/commit/tests/gem.scm?id=ce8963c5b7a728257920aeceeb89e40d166d09f4'>tests: Adjust for 'http-fetch' change in (guix import json).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-12-18 09:55:17 +0100'>2016-12-18</span></td><td><a href='/guix/commit/tests/gem.scm?id=506abddb99e02f824bff7ed7d7f7b37c4dafe0a7'>tests: Mock up http-fetch in import tests.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>