Implement the following DxEng* functions:
- DxEngAltLockSurface
- DxEngDeleteSurface
- DxEngReferenceHdev
- DxEngSelectBitmap
- DxEngSetBitmapOwner
- DxEngUnreferenceHdev
Update their prototypes and call the appropriate win32k functions
inside them, since they are already implemented. Also get rid of
now unused IntGdi(Un)ReferencePdev, whose were called only by dxeng,
and whose are not used anymore. In Windows, DxEng(Un)ReferenceHdev calls
PDEVOBJ_vReferencePDEV and PDEVOBJ_vDeferencePDEV directly (those
correspond to our PDEVOBJ_vReference and PDEVOBJ_vRelease accordingly).
Required by MS DirectDraw stack (ddraw.dll & dxg.sys). CORE-17561
- Change INIT_FUNCTION and INIT_SECTION to CODE_SEG("INIT") and DATA_SEG("INIT") respectively
- Remove INIT_FUNCTION from function prototypes
- Remove alloc_text pragma calls as they are not needed anymore
