rustbuild: Run dist on a distcheck

This is what the nightly bots expect, so let's be sure to do that.

Author: alexcrichton

src/bootstrap/mk/Makefile.in

@@ -56,7 +56,8 @@ check-cargotest:
 dist:
 	$(Q)$(BOOTSTRAP) dist $(BOOTSTRAP_ARGS)
 distcheck:
-	$(Q)$(BOOTSTRAP) test distcheck
+	$(Q)$(BOOTSTRAP) dist $(BOOTSTRAP_ARGS)
+	$(Q)$(BOOTSTRAP) test distcheck $(BOOTSTRAP_ARGS)
 install:
 	$(Q)$(BOOTSTRAP) dist --install $(BOOTSTRAP_ARGS)
 tidy: