gdi: Return proper values from device context driver APIs

[Phil Krylov]

Hi,

This patch fixes EMF generation 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 SetTextAlign(), SetBkMode(), SetROP2(), SetPolyFillMode(), and
SetStretchBltMode() to assume that the corresponding DC driver functions
return only a BOOL success flag, and therefore a proper return value should
be generated by the main function. Fixed EMFDRV_StretchDIBits() to return a
proper value (like MFDRV_StretchDIBits already does). Added comments about
other cases of improper return values.

-- Ph.
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