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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<tr><td><span title='2021-05-04 09:44:14 +0200'>2021-05-04</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=ec4012c5820fb139d07dee492f8b0d492ec1c042'>gnu: sequoia: Update to 1.1.0.</a><span class='msg-avail'>...</span></td><td>Hartmut Goebel</td></tr>
<tr><td><span title='2021-03-22 11:20:17 +0200'>2021-03-22</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=ff1c7e40252337cb2c992c2d41e0ed4cefe56df0'>gnu: sequoia4pEp: Adjust inputs.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-03-22 09:54:19 +0200'>2021-03-22</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=4d0fe40f65e096a4d07f4cc8c95139a4dda96c53'>gnu: sequoia4pEp: Move to sequoia.scm.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-01-30 15:34:41 +0100'>2021-01-30</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=880e6334b7aeda04ad8572f9c68a9055de15aeb8'>gnu: rust-dirs-2: Drop minor version from name.</a><span class='msg-avail'>...</span></td><td>Nicolas Goaziou</td></tr>
<tr><td><span title='2021-01-08 10:33:12 +0100'>2021-01-08</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=a240686cc34454a3221c31f3c546985c2c90bf2c'>gnu: sequoia: Update to 1.0.0.</a><span class='msg-avail'>...</span></td><td>Hartmut Goebel</td></tr>
<tr><td><span title='2021-01-03 20:55:47 +0200'>2021-01-03</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=d76f073aba307bcf0b277290c161a8c054c1c549'>gnu: rust-anyhow-1: Drop minor version from name.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-12-02 21:53:44 +0100'>2020-12-02</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=6f9edf40b83782d81f4c1c91d97aa11d042506e0'>gnu: sequoia: Update to 0.20.0.</a><span class='msg-avail'>...</span></td><td>Hartmut Goebel</td></tr>
<tr><td><span title='2020-10-12 11:41:40 +0530'>2020-10-12</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=93922eecc9f8dec90dca8fdf1df163db42c196e5'>gnu: rust-flate2-1.0: Remove minor version from variable name.</a><span class='msg-avail'>...</span></td><td>Arun Isaac</td></tr>
<tr><td><span title='2020-10-12 11:41:39 +0530'>2020-10-12</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=2cc9d2a7cf27a45cf4927fa8a5cdc6d36b05ea09'>gnu: rust-percent-encoding-2.1: Remove minor version from variable name.</a><span class='msg-avail'>...</span></td><td>Arun Isaac</td></tr>
<tr><td><span title='2020-10-12 11:41:39 +0530'>2020-10-12</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=ff4d0937c71318b42ee6d86487df72aae49da6f8'>gnu: rust-url-2.1: Remove minor version from variable name.</a><span class='msg-avail'>...</span></td><td>Arun Isaac</td></tr>
<tr><td><span title='2020-10-12 11:41:38 +0530'>2020-10-12</span></td><td><a href='/guix/commit/gnu/packages/sequoia.scm?id=262e40d095dd6851577540fd9bb4023c4565e53e'>gnu: rust-thiserror-1.0: Remove minor version from variable name.</a><span class='msg-avail'>...</span></td><td>Arun Isaac</td></tr>