Use two longs instead of one for the first parameter of EngCreateBitmap export. Make it same as win32k export.
MSDN documentation says that 1st parameter is SIZEL (SIZE) structure, which actually contains 2 longs inside. Sice it is passed by value, it needs to take enough memory when export in dxgthk and redirect to win32k (since it's actually a win32k function).
Fixes the compilation of our dxg.sys when calling dxgthk!EngCreateBitmap from it.
Found during my DirectX investigations.
There is no need to compile our DLLs as shared libraries since we are
managing symbols exports and imports through spec files.
On my system, this reduces the configure-time by a factor of two.
