only use nonfatal assertions for GLib that actually supports it

Fixes tests on Debian 7 and RHEL 6

Author: ailin-nemui

tests/fe-common/core/test-formats.c

@@ -31,7 +31,9 @@ int main(int argc, char **argv)
 		g_free(name);
 	}
 
+#if GLIB_CHECK_VERSION(2,38,0)
 	g_test_set_nonfatal_assertions();
+#endif
 	return g_test_run();
 }
 

tests/irc/core/test-irc.c

@@ -197,7 +197,9 @@ int main(int argc, char **argv)
 		g_free(name);
 	}
 
+#if GLIB_CHECK_VERSION(2,38,0)
 	g_test_set_nonfatal_assertions();
+#endif
 	return g_test_run();
 }