opengl的库中的静态链接库glext.lib

GLEXTisaWin32DLLwithheaderandlinkerlibrary,designedusingMicrosoftVisualStudio2012.ItimplementsallpubliclyavailableOPENGLextensionsasstaticfunctions,thatcanbedirectlycalledwithoutthedangerofrunningintoNULLpointerexceptions.