ddraw.h updates:

- Add missing members in DDPIXELFORMAT struct.
 (wine git commit 7a4ca1b0b2b5203b7ec9c7b56f9ccf25691ba91f)
- Add missing UpdateOverlay flags.
 (wine git commit 577ee2938f89c23a10e63ea9910f2c9c8fdaf426)
- Add missing DDSCAPS2.dwCaps2 flags.
 (wine git commit f4c382f980b2971929e0b5a7681ecfb0bf1356de)
- Add DDSCAPS2.dwCaps3 flags.
 (wine git commit 67a86980077f68ba0a54d3444a4fa595eb2c1aa3)
- Add HMONITOR compatibility definition.