Use GO variable in go-check target (#13146) (#13147)

Makefile

@@ -186,7 +186,7 @@ help:
 
 .PHONY: go-check
 go-check:
-	$(eval GO_VERSION := $(shell printf "%03d%03d%03d" $(shell go version | grep -Eo '[0-9]+\.[0-9.]+' | tr '.' ' ');))
+	$(eval GO_VERSION := $(shell printf "%03d%03d%03d" $(shell $(GO) version | grep -Eo '[0-9]+\.[0-9.]+' | tr '.' ' ');))
 	@if [ "$(GO_VERSION)" -lt "$(MIN_GO_VERSION)" ]; then \
 		echo "Gitea requires Go 1.13 or greater to build. You can get it at https://golang.org/dl/"; \
 		exit 1; \