Disable 667-jit-jni-stub on redefine-stress

Redefine stress config enables jit-on-first-use which disables
Jit GC which is required by this test.

Bug: 207122844
Test: test.py -t 667-jit-jni-stub --redefine-stress
Change-Id: I68b560ed4ae20d9b59900883fbfd3b889bf8283a
diff --git a/test/knownfailures.json b/test/knownfailures.json
index b256c4d..ce4ada4 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -1473,7 +1473,7 @@
     },
     {
         "tests": ["667-jit-jni-stub"],
-        "variant": "jit-on-first-use",
+        "variant": "jit-on-first-use | redefine-stress",
         "description": ["jit-on-first-use disables jit GC but this test requires jit GC"]
     }
 ]