dbghelp: SymFindFileInPath doesn't check for the parameters passed when looking in a directory, whatever the dbghelp's options.

When looking for a .DBG file, first look for a .DBG file matching all
attributes, then for a .DBG partially matching the attributes.

When looking for a PDB file, no longer use SymFindFileInPath as it
doesn't actually check the signatures, but use an internal function
instead.

If the MNS_CHECKORBMP style is set on a menu, and the menu is checked,
the bitmap is not drawn. For the menu tests, that means we get no
WM_DRAWITEM message for an owner-drawn bitmap, and the bounding box of
the bitmap is not tested. We should leave the menu item unchecked in
this case so we can test it.

Since those surfaces are stored in blocks, the 4 pixel step doesn't only apply to surfaces < 4, but
also to surfaces bigger than that, with a non-multiple-of-4 size.