Fix prototype of debugCallbackWrap
Fix prototype of debugCallbackWrap

Declaration in src/OpenGl/OpenGl_glext.h is:

  typedef void (APIENTRY *GLDEBUGPROCARB)(GLenum source,GLenum type,GLuint id,GLenum severity,GLsizei length,const GLchar *message,GLvoid *userParam);

OCCT 6.7.0 ships an updated version of glext.h, which has a different
signature (with respect to the last argument).  So maybe this change
will be reverted if glext.h is updated.

BenoitPerrot/oce,tpaviot/oce,tpaviot/oce,BenoitPerrot/oce,BenoitPerrot/oce,tpaviot/oce,tpaviot/oce,BenoitPerrot/oce,BenoitPerrot/oce,tpaviot/oce