Makefile: add unsupported to docker windows image tag and bin version

Makefile

@@ -10,8 +10,9 @@ UNITWORKDIR = "/var/lib/neo-go"
 
 DC_FILE=.docker/docker-compose.yml
 
+GOOS ?= $(shell go env GOOS)
 REPO ?= "$(shell go list -m)"
-VERSION ?= "$(shell git describe --tags 2>/dev/null | sed 's/^v//')"
+VERSION ?= "$(shell git describe --tags 2>/dev/null | sed 's/^v//')$(shell if [ "$(GOOS)" = "windows" ]; then echo "_unsupported"; fi)"
 BUILD_FLAGS = "-X '$(REPO)/pkg/config.Version=$(VERSION)'"
 
 IMAGE_REPO=nspccdev/neo-go