db/test: dbStressLock skip for RTEMS

This test assumes that several threads with
equal priority will all run eventually.
This isn't true an UP target without
time sliced scheduling (eg. RTEMS).

src/ioc/db/test/dbStressLock.c

@@ -228,6 +228,11 @@ MAIN(dbStressTest)
 
     testPlan(80+nworkers*3);
 
+#if defined(__rtems__)
+    testSkip(80+nworkers*3, "Test assumes time sliced preempting scheduling");
+    return testDone();
+#endif
+
     priv = callocMustSucceed(nworkers, sizeof(*priv), "no memory");
 
     testDiag("lock set stress test");