enhmfdrv: Return proper values from GDI APIs

[Phil Krylov]

Hi,

This patch fixes EMF rendering in some programs that depend on the fact
that SetTextAlign(), SetBkMode(), SetROP2(), SetPolyFillMode(), and
SetStretchBltMode() return proper values when called on a EMF device
context.


ChangeLog:

Fixed EMFDRV_SetTextAlign, EMFDRV_SetBkMode, EMFDRV_SetROP2,
EMFDRV_SetPolyFillMode, and EMFDRV_SetStretchBltMode to return proper
old values of modes that are being set. Added FIXMEs for other cases of
improper return values.

-- Ph.
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