DDRAW: Add surface locking

[Matthew Mastracci]

This patch fixes Picasa2 - it seems to rely on getting a busy message 
from a second IDirectDrawSurface->Lock() call.  It also adds some lock 
checks to the blit functions for correctness.

Changelog:

  * dlls/ddraw/ddraw_private.h

     Matthew Mastracci <mmastrac at canada.com>
     Add locked flag for DirectDraw surfaces

  * dlls/ddraw/dsurface/main.c

     Matthew Mastracci <mmastrac at canada.com>
     Update locked flag in Lock and Unlock calls, return 
DDERR_SURFACEBUSY if surface already locked

  * dlls/ddraw/dsurface/dib.c

     Matthew Mastracci <mmastrac at canada.com>
     Return DDERR_SURFACEBUSY if surface already locked in blit

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