gdi32: Make AddFontToList skip adding a face into global lists if the font is not supposed to be enumerated, and return a pointer to first loaded face.

Experiments show xcopy under Windows does not use argc/argv logic for
treating double quotes and backslashes. The xcopy logic is simplified
because literal quotes are illegal in Windows file names, thus escaped
double quotes (\") need not be treated.  'XCOPY "c:\dir a" "c:\dir
b\"' works under Windows.