Fix a test failure on 32-bit systems.

Taken from upstream:
https://gitlab.freedesktop.org/mesa/mesa/commit/dd1dba80b9ee74ec8b90761285a8262e374bf8ef

diff --git a/src/util/tests/timespec/timespec_test.cpp b/src/util/tests/timespec/timespec_test.cpp
--- a/src/util/tests/timespec/timespec_test.cpp
+++ b/src/util/tests/timespec/timespec_test.cpp
@@ -206,7 +206,7 @@ TEST(timespec_test, timespec_from_nsec)
 
    timespec_from_nsec(&a, UINT64_MAX);
    EXPECT_EQ(a.tv_nsec, UINT64_MAX % NSEC_PER_SEC);
-   EXPECT_EQ(a.tv_sec, UINT64_MAX / NSEC_PER_SEC);
+   EXPECT_EQ(a.tv_sec, (time_t)(UINT64_MAX / NSEC_PER_SEC));
 }
 
 TEST(timespec_test, timespec_from_usec)
alue='2ebeeeb438d09142f772d56af7a600ff1d3c43bd'/><select name='h' onchange='this.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>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=2ebeeeb438d09142f772d56af7a600ff1d3c43bd'>refs</a><a class='active' href='/guix/log/etc/substitutes/berlin.guix.gnu.org.pub'>log</a><a href='/guix/tree/etc/substitutes/berlin.guix.gnu.org.pub?id=2ebeeeb438d09142f772d56af7a600ff1d3c43bd'>tree</a><a href='/guix/commit/etc/substitutes/berlin.guix.gnu.org.pub?id=2ebeeeb438d09142f772d56af7a600ff1d3c43bd'>commit</a><a href='/guix/diff/etc/substitutes/berlin.guix.gnu.org.pub?id=2ebeeeb438d09142f772d56af7a600ff1d3c43bd'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/etc/substitutes/berlin.guix.gnu.org.pub'>
<input type='hidden' name='id' value='2ebeeeb438d09142f772d56af7a600ff1d3c43bd'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=2ebeeeb438d09142f772d56af7a600ff1d3c43bd'>root</a>/<a href='/guix/log/etc?id=2ebeeeb438d09142f772d56af7a600ff1d3c43bd'>etc</a>/<a href='/guix/log/etc/substitutes?id=2ebeeeb438d09142f772d56af7a600ff1d3c43bd'>substitutes</a>/<a href='/guix/log/etc/substitutes/berlin.guix.gnu.org.pub?id=2ebeeeb438d09142f772d56af7a600ff1d3c43bd'>berlin.guix.gnu.org.pub</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/etc/substitutes/berlin.guix.gnu.org.pub?id=2ebeeeb438d09142f772d56af7a600ff1d3c43bd&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-07-10 00:11:00 +0200'>2020-07-10</span></td><td><a href='/guix/commit/etc/substitutes/berlin.guix.gnu.org.pub?id=d283bb960f927dd5f7bb8b96bc697221e4e8ad39'>maint: Remove traces of "berlin.guixsd.org".</a><span class='msg-avail'>...<span class='msg-tooltip'>The guixsd.org domain is no longer advertised since before in 1.0.0
release in May 2019.

* etc/substitutes/berlin.guixsd.org.pub: Rename to...
* etc/substitutes/berlin.guix.gnu.org.pub: ... this.
* etc/substitutes/ci.guix.gnu.org.pub,
etc/substitutes/ci.guix.info.pub: Adjust accordingly.
* gnu/services/base.scm (%default-authorized-guix-keys): Likewise.
* guix/build/download-nar.scm (urls-for-item): Likewise.
* guix/self.scm (miscellaneous-files): Likewise.
* Makefile.am (dist_pkgdata_DATA): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>