Support windows on ARM, (fixes fusesource#238)

Makefile

@@ -19,6 +19,7 @@ linux-armv6-digest:=@sha256:7bad6ab302af34bdf6634c8c2b02c8dc6ac932c67da9ecc199c5
 linux-x86-digest:=@sha256:7a8fda5ff1bb436ac1f2e7d40043deb630800fce33d123d04779d48f85702dcd
 windows-static-x86-digest:=@sha256:896bd4a43bbc89502904afdc8d00e6f2422f8f35852cc59777d6426bfc8491e8
 windows-static-x64-digest:=@sha256:f159861bc80b29e5dafb223477167bec53ecec6cdacb051d31e90c5823542100
+windows-arm64-digest:=@sha256:f4b3c1a49ec8b53418cef1499dc3f9a54a5570b7a3ecdf42fc8c83eb94b01b7d
 cross-build-digest:=@sha256:8dbaa86462270db93ae1b1b319bdd88d89272faf3a68632daf4fa36b414a326e
 freebsd-crossbuild-digest:=@sha256:cda62697a15d8bdc0bc26e780b1771ee78f12c55e7d5813e62c478af5a747c43
 mcandre-snek-digest:=@sha256:9f84e9fcdf66daafc1f1c3fb772a6c97977714e17800aeac2e3bbe5dc5039dd0
@@ -78,7 +79,7 @@ NATIVE_DLL:=$(NATIVE_DIR)/$(LIBNAME)
 # For cross-compilation, install docker. See also https://github.com/dockcross/dockcross
 # Disabled linux-armv6 build because of this issue; https://github.com/dockcross/dockcross/issues/190
 native-all: linux-x86 linux-x86_64 linux-arm linux-armv6 linux-armv7 \
-	linux-arm64 linux-ppc64 win-x86 win-x86_64 mac-x86 mac-x86_64 mac-arm64 freebsd-x86 freebsd-x86_64
+	linux-arm64 linux-ppc64 win-x86 win-x86_64 win-arm64 mac-x86 mac-x86_64 mac-arm64 freebsd-x86 freebsd-x86_64
 
 native: $(NATIVE_DLL)
 
@@ -132,6 +133,12 @@ target/dockcross/dockcross-windows-static-x64: dockcross
 win-x86_64: download-includes target/dockcross/dockcross-windows-static-x64
 	target/dockcross/dockcross-windows-static-x64 bash -c 'make clean-native native CROSS_PREFIX=x86_64-w64-mingw32.static- OS_NAME=Windows OS_ARCH=x86_64'
 
+target/dockcross/dockcross-windows-arm64: dockcross
+	docker run --rm dockcross/windows-arm64$(windows-arm64-digest) > target/dockcross/dockcross-windows-arm64
+	chmod +x target/dockcross/dockcross-windows-arm64
+win-arm64: download-includes target/dockcross/dockcross-windows-arm64
+	target/dockcross/dockcross-windows-arm64 bash -c 'make clean-native native CROSS_PREFIX=aarch64-w64-mingw32- OS_NAME=Windows OS_ARCH=arm64'
+
 mac-x86: download-includes
 	docker run -it --rm -v $$PWD:/workdir --user $$(id -u):$$(id -g) \
 		-e CROSS_TRIPLE=i386-apple-darwin multiarch/crossbuild$(cross-build-digest) make clean-native native OS_NAME=Mac OS_ARCH=x86