Remove META.json from the all: target

It is only needed for releases to PGXN, not building, testing, or anything else.

pgmq-extension/Makefile

@@ -17,7 +17,7 @@ PG_CONFIG   ?= pg_config
 PGXS := $(shell $(PG_CONFIG) --pgxs)
 include $(PGXS)
 
-all: sql/$(EXTENSION)--$(EXTVERSION).sql META.json Trunk.toml
+all: sql/$(EXTENSION)--$(EXTVERSION).sql Trunk.toml
 
 sql/$(EXTENSION)--$(EXTVERSION).sql: sql/$(EXTENSION).sql
 	cp $< $@