Fixes 63 Win64 compile warnings.

gdi32: The special handling of the character codes metrics for symbol fonts should be based on the presence of the MS symbol charmap rather than whether the font is enumerated as SYMBOL_CHARSET.

GdipCreateBitmapFromHBITMAP currently assumes that all bitmaps are
top-down, even though a positive height (which it also assumes)
signals a bottom-up DIB. The net result is that
GdipCreateBitmapFromHBITMAP flips images vertically.

We need to take into account the trailing NULL in envp.

gdi32/tests: Win9x doesn't ensure the facename is nul terminated. Compare the logfont one element at a time.

Add a new wined3d-internal PreLoad function to textures and surfaces
that takes a parameter specifying wether the rgb or srgb texture
should be loaded.

This reduces the number of srgb switching reloads quite a lot. The only
situation in which a reload is needed is if the rgb copy is modified on the GL
side and the srgb copy is needed.

ole32: Round the extected size in the marshal and moniker tests using the results of sizing a global, not a heap pointer.

The rounding isn't the same on Win9x, and the size being compared to
is that of a global handle.