adapt Makefile to produce a gmv_runner.exe for windows
adapt Makefile to produce a gmv_runner.exe for windows

gaubert/gmvault,guaycuru/gmvault,erdincay/gmvault,erdincay/gmvault,guaycuru/gmvault,gaubert/gmvault,guaycuru/gmvault,gaubert/gmvault,erdincay/gmvault