build: Support building on Windows

make-go.bash

@@ -70,12 +70,20 @@ if [ ! -e ../VERSION ]; then
     echo "$(git describe --tags)" > ../VERSION
 fi
 
-./make.bash --no-banner
+BUILDER_EXT=bash
+case "$(uname)" in
+    *MINGW* | *WIN32* | *CYGWIN*)
+        BUILDER_EXT=bat
+        ;;
+esac
+
+./make.${BUILDER_EXT} --no-banner
+
 cp -a ../bin "${GOROOT_FINAL}"/
 cp -a ../pkg "${GOROOT_FINAL}"/
 cp -a ../src "${GOROOT_FINAL}"/
 
-if [[ -e ./make.bash ]]; then
+if [[ -e ./make.${BUILDER_EXT} ]]; then
     pushd ../
     git clean -f
     popd

make-syncthing.bash

@@ -35,6 +35,12 @@ unset GOPATH #Set by build.go
 export GOROOT=${MYDIR}/ext/golang/dist/go-${GOOS}-${GOARCH}
 export PATH=${GOROOT}/bin:${PATH}
 
+case "$(uname)" in
+    *CYGWIN*)
+        export GOROOT=`cygpath -w $GOROOT`
+        ;;
+esac
+
 pushd ext/syncthing/src/github.com/syncthing/syncthing
 
 _GOOS=$GOOS