gdi32: Avoid uninitialized variable use in EnumEnhMetaFile (MSVC).

[Thomas Faber]

info->init_transform is never used if no hdc is present, so calculating
it is pointless -- and also uses vp_size and win_size uninitialized.

MSVC builds with /RTCu complain about this when running test_ExtTextOut
(at "xscale = (double)vp_size.cx / (double)win_size.cx;")

The patch looks big due to indentation changes, but diff -w shows that
it's trivial.
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