emitnative: Disable warning in delete_fast for now (breaks test).

py/emitnative.c

@@ -1636,7 +1636,9 @@ STATIC void emit_native_store_subscr(emit_t *emit) {
 STATIC void emit_native_delete_fast(emit_t *emit, qstr qst, mp_uint_t local_num) {
     // TODO implement me!
     // could support for Python types, just set to None (so GC can reclaim it)
-    mp_emitter_warning(emit->pass, "Native codegeneration doesn't support deleting local");
+    // local is automatically deleted for exception block "as" var, and the message
+    // breaks tests.
+    //mp_emitter_warning(emit->pass, "Native codegeneration doesn't support deleting local");
 }
 
 STATIC void emit_native_delete_deref(emit_t *emit, qstr qst, mp_uint_t local_num) {