prlimit(2) returns ENOSYS on Linux 2.6.32-5-xen-amd64 as found on
hydra.gnu.org, and strace(1) doesn't recognize it.

--- glib-2.34.3/glib/tests/thread.c	2012-11-20 15:27:12.000000000 +0100
+++ glib-2.34.3/glib/tests/thread.c	2013-03-27 14:48:31.000000000 +0100
@@ -130,7 +130,7 @@ test_thread3 (void)
 static void
 test_thread4 (void)
 {
-#ifdef HAVE_PRLIMIT
+#if 0
   struct rlimit ol, nl;
   GThread *thread;
   GError *error;
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<tr><td><span title='2020-06-26 18:39:29 +0200'>2020-06-26</span></td><td><a href='/guix/commit/gnu/installer.scm?id=3f44034e8ff8df9e27c3c05c1db9d18a413f0ddc'>installer: Use latest Guile.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
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<tr><td><span title='2023-08-18 16:02:34 +0200'>2023-08-18</span></td><td><a href='/guix/commit/gnu/ci.scm?id=560cb51e7b37e2c6f6fe4b72a3781185c57fdf83'>gnu: commencement: Use system in %final-inputs.</a><span class='msg-avail'>...</span></td><td>Christopher Baines</td></tr>
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<tr><td><span title='2023-03-09 18:14:25 +0100'>2023-03-09</span></td><td><a href='/guix/commit/gnu/ci.scm?id=768b7705977aa951c36bd37e48956bf91dcc7719'>ci: Update the list of GCC versions for the 'core' subset.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-10-22 01:46:55 +0200'>2022-10-22</span></td><td><a href='/guix/commit/gnu/ci.scm?id=a3619079f95213c4f983e69210ed12b38fd31022'>Remove now unnecessary uses of (guix grafts).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
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<tr><td><span title='2022-08-17 11:29:38 +0200'>2022-08-17</span></td><td><a href='/guix/commit/gnu/ci.scm?id=5bbb9af5d99314a79d7f6535d9a3176c2c10e60b'>ci: Fix the images specification.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
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