dlls/gdi: fix GetGlyphOutline

[Tanabe Hiroshi]

Hi,
This patch fixes GetGlyphOutline() related problems.

Changelog:
Added Multibyte charactor set support.
Remove (buf && !buflen) checking. It's probably redundant.
Fixed outline rendering with GGO_GRAY?_BITMAP option.
Improved fixed-pitch fonts detection.
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