Delete dangling function prototype in Fixture internals

extras/fixture/src/unity_fixture_internals.h

@@ -38,9 +38,4 @@ void UnityPointer_Set(void** ptr, void* newValue);
 void UnityPointer_UndoAllSets(void);
 void UnityPointer_Init(void);
 
-void UnityAssertEqualPointer(const void * expected,
-                            const void * actual,
-                            const char* msg,
-                            const UNITY_LINE_TYPE lineNumber);
-
 #endif /* UNITY_FIXTURE_INTERNALS_H_ */