POINTS structure macros bugs on sparc

[Eric Frias]

More endian bugs.  The MAKEPOINTS and POINTSTOPOINT macros convert between
points packed into a DWORD and a structure. On little-endian systems, this
can be done with a simple cast, on big endians, either the macro needs to be
more complex, or the order of elements in the structure needs to be
reveresed, and I think the former is the only correct way to do it.

I couldn't figure out a way to make the semantics of MAKEPOINTS on a
big-endian identical to the little-endian version without using gcc
extensions.  I'd rather avoid them, but I guess most of us will be using gcc
anyway.  Maybe someone knows of a better way to implement these macros.

There is also one change to winefile required, since it assumed that
MAKEPOINTS was really a cast.

Eric
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