common-rules.mk: Add make rustup to check rust toolchain status

mk/spksrc.common-rules.mk

@@ -2,12 +2,27 @@
 
 ###
 
+.PHONY: clean
 clean:
 	rm -fr work work-* build-*.log publish-*.log status-*.log
 
+.PHONY: smart-clean
 smart-clean:
 	rm -rf $(WORK_DIR)/$(PKG_DIR)
 	rm -f $(WORK_DIR)/.$(COOKIE_PREFIX)*
 
+.PHONY: changelog
 changelog:
 	git log --pretty=format:"- %s" -- $(PWD)
+
+# If the first argument is "run"...
+ifeq (rustup,$(firstword $(MAKECMDGOALS)))
+  # use the rest as arguments for "run"
+  RUN_ARGS := $(wordlist 2,$(words $(MAKECMDGOALS)),$(MAKECMDGOALS))
+  # ...and turn them into do-nothing targets
+  $(eval $(RUN_ARGS):;@:)
+endif
+
+.PHONY: rustup
+rustup:
+	@rustup $(RUN_ARGS)