kratactl: initial windows bringup

hack/build/cross-compile.sh

@@ -14,8 +14,14 @@ then
 fi
 
 HOST_OS="$(uname -s)"
+HOST_OS="$(echo "${HOST_OS}" | awk -F '_' '{print $1}')"
 HOST_OS="$(echo "${HOST_OS}" | tr '[:upper:]' '[:lower:]')"
 
+if [ "${HOST_OS}" = "mingw64" ]
+then
+  HOST_OS="windows"
+fi
+
 if [ -z "${TARGET_OS}" ]
 then
   TARGET_OS="${HOST_OS}"