[PATCH 1/2] gdi32: Improve glyph positioning for the subpixel case in get_glyph_outline.

[Sam Edwards]

It turns out, the cause for the crashes on my other patch was the glyph 
positioning logic for subpixel-rendered glyphs. When y_shift was 
negative, the destination pointer was decremented(!) outside of the 
buffer and wrecked the stack.

The new logic in this patch allows negative shifts, and instead moves 
the source pointer appropriately. This makes sure that the glyph is 
blitted in the proper position even when it's too big for the 
destination buffer (which is the case when clipping the glyph to the 
font metrics).
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