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='2020-03-02 23:39:44 +0100'>2020-03-02</span></td><td><a href='/guix/commit/gnu/tests/cups.scm?id=15a6805751309452616999933492f1fb9da8bcec'>gnu: Add system test for CUPS.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/tests/cups.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Adjust accordingly.
</span></span></td><td>Marius Bakke</td></tr>