pg_alterckey: remove TAP check rules from Makefile

Reported-by: Pavel Stehule, Michael Paquier

Discussion: https://postgr.es/m/CAFj8pRBRNo4co5bqCx4BLx1ZZ45Z_T-opPxA+u7SLp7gAtBpNA@mail.gmail.com

Backpatch-through: master

src/bin/pg_alterckey/Makefile

@@ -36,9 +36,3 @@ uninstall:
 clean distclean maintainer-clean:
 	rm -f pg_alterckey$(X) $(OBJS)
 	rm -rf tmp_check
-
-check:
-	$(prove_check)
-
-installcheck:
-	$(prove_installcheck)