gdi32::MaskBlt

pub unsafe extern "system" fn MaskBlt(hdcDest: HDC, xDest: c_int, yDest: c_int, width: c_int, height: c_int, hdcSrc: HDC, xSrc: c_int, ySrc: c_int, hbmMask: HBITMAP, xMask: c_int, yMask: c_int, rop: DWORD) -> BOOL