Fix detection of old MinGW toolchains
Fix detection of old MinGW toolchains

noikiy/ShadowVPN,bjrara/ShadowVPN,noikiy/ShadowVPN,test1943/ShadowVPN,froggatt/ShadowVPN,bjrara/ShadowVPN,sunclx/ShadowVPN,froggatt/ShadowVPN,test1943/ShadowVPN,sunclx/ShadowVPN