Disables 667-jit-jni on  jit-on-first-use configuration

jit-on-first-use disables jit GC and this test requires
Jit GCs enabled as this tests if jited jni stubs are being
collected

Test: test.py -t 667-jit-jni --jit-on-first-use
Change-Id: Icc960ec1cc6cc3c13d7d01d51709541512cf4fec
diff --git a/test/knownfailures.json b/test/knownfailures.json
index 89deae5..b256c4d 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -1470,5 +1470,10 @@
         "variant": "redefine-stress & jit | jvmti-stress & jit",
         "description": ["Test expects few methods to be interpreted but jvmti enables",
 		        "jit-on-first-use which breaks this expectation"]
+    },
+    {
+        "tests": ["667-jit-jni-stub"],
+        "variant": "jit-on-first-use",
+        "description": ["jit-on-first-use disables jit GC but this test requires jit GC"]
     }
 ]