static: remove unused docker-proxy.exe binary from Windows packages

The `docker-proxy.exe` binary was added to the static Windows packages through
commit 09541b5 (which introduced a bug, later
fixed through fc5379f).

It looks like that commit added the `docker-proxy.exe` binary with the
assumption that it's used on Windows (given that its also built in upstream),
but recent discussions revealed that's not the case.

This patch removes binary from the static packages for Windows, because it's
not used.

A quick look at Docker Desktop's build scripts show that it's not included
in those packages, and installation instructions for static binaries on
Windows do not mention this binary, so no further changes should be needed.

Signed-off-by: Sebastiaan van Stijn <[email protected]>

static/Makefile

@@ -85,7 +85,6 @@ cross-win: cross-win-engine
 	mkdir -p build/win/amd64/docker
 	cp $(CLI_DIR)/build/docker-windows-amd64.exe build/win/amd64/docker/docker.exe
 	cp $(ENGINE_DIR)/bundles/cross/win/dockerd.exe build/win/amd64/docker/dockerd.exe
-	cp $(ENGINE_DIR)/bundles/cross/win/docker-proxy.exe build/win/amd64/docker/docker-proxy.exe
 	docker run --rm -v $(CURDIR)/build/win/amd64:/v -w /v alpine sh -c 'apk update&&apk add zip&&zip -r docker-$(GEN_STATIC_VER).zip docker'
 	$(CHOWN) -R $(shell id -u):$(shell id -g) build