Fix: Do not re-parent calls to interface super methods. (#150)

The existing logic is wrong, and they will always be valid as-is because any superinterfaces will be merged onto the target class.

src/main/java/org/spongepowered/asm/mixin/transformer/MixinTargetContext.java

@@ -871,6 +871,10 @@ private void processImaginarySuper(MethodNode method, FieldInsnNode fieldInsn) {
      * @param methodRef Unbound reference to the method
      */
     private void updateStaticBinding(MethodNode method, MemberRef methodRef) {
+        if (!methodRef.getOwner().equals(this.classNode.superName)) {
+            // Must be to an interface, no need to re-parent.
+            return;
+        }
         this.updateBinding(method, methodRef, Traversal.SUPER);
     }