tests/test-util-filemonitor: Skip test on non-x86 Travis containers

test-util-filemonitor fails in restricted non-x86 Travis containers
since they apparently blacklisted some required system calls there.
Let's simply skip the test if we detect such an environment.

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Cleber Rosa <crosa@redhat.com>
Tested-by: Cleber Rosa <crosa@redhat.com>
Message-Id: <20191204154618.23560-6-thuth@redhat.com>

tests/test-util-filemonitor.c

@@ -406,10 +406,21 @@ test_file_monitor_events(void)
     char *pathdst = NULL;
     QFileMonitorTestData data;
     GHashTable *ids = g_hash_table_new(g_int64_hash, g_int64_equal);
+    char *travis_arch;
 
     qemu_mutex_init(&data.lock);
     data.records = NULL;
 
+    /*
+     * This test does not work on Travis LXD containers since some
+     * syscalls are blocked in that environment.
+     */
+    travis_arch = getenv("TRAVIS_ARCH");
+    if (travis_arch && !g_str_equal(travis_arch, "x86_64")) {
+        g_test_skip("Test does not work on non-x86 Travis containers.");
+        return;
+    }
+
     /*
      * The file monitor needs the main loop running in
      * order to receive events from inotify. We must