[tests] Skip RuntimeCallStatsTest due to flaky timers

test/unittests/unittests.status

Index: test/unittests/unittests.status
diff --git a/test/unittests/unittests.status b/test/unittests/unittests.status
index ef38074361ad43da6e9aabe825791594952c259e..5cb42e0ae3b1e5a76848465f6da36908b64fa242 100644
--- a/test/unittests/unittests.status
+++ b/test/unittests/unittests.status
@@ -3,6 +3,11 @@
 # found in the LICENSE file.
 
 [
+[ALWAYS, {
+    # BUG(5677): Real timers are flaky
+    'RuntimeCallStatsTest.*': [SKIP],
+}], # ALWAYS
+
 ['arch == x87', {
   'Ieee754.Expm1': [SKIP],
   'Ieee754.Cos': [SKIP],