fix for wxMac, older wxMac 2.8 has different wxGLCanvas constructor signature than 2.9, todo: proper fix checking wxWidget's version number
fix for wxMac, older wxMac 2.8 has different wxGLCanvas constructor signature than 2.9,
todo: proper fix checking wxWidget's version number

nakijun/vtp,nakijun/vtp,nakijun/vtp,nakijun/vtp,nakijun/vtp