Fix qmk_install.sh to properly target MSYS (#3455)

* qmk_install fix for windows users.

* Updated wildcard to caputre both MSYS and MINGW64 in qmk_install

* added OR to windows qmk_install

util/qmk_install.sh

@@ -10,7 +10,7 @@ case $(uname) in
 	Linux)
 		exec "${util_dir}/linux_install.sh"
 	;;
-	MSYS_NT*)
+	MSYS_NT*|MINGW_64*)
 		exec "${util_dir}/msys2_install.sh"
 	;;
 esac