Function gl::GetDebugMessageLog

pub unsafe fn GetDebugMessageLog(count: GLuint,
                                 bufSize: GLsizei,
                                 sources: *mut GLenum,
                                 types: *mut GLenum,
                                 ids: *mut GLuint,
                                 severities: *mut GLenum,
                                 lengths: *mut GLsizei,
                                 messageLog: *mut GLchar)
                                 -> GLuint

Fallbacks: GetDebugMessageLogARB, GetDebugMessageLogKHR