Function gl::DebugMessageInsert

pub unsafe fn DebugMessageInsert(
    source: GLenum, 
    type_: GLenum, 
    id: GLuint, 
    severity: GLenum, 
    length: GLsizei, 
    buf: *const GLchar
)

Fallbacks: DebugMessageInsertARB, DebugMessageInsertKHR