[Bug 47872] gdiplus:font fails in Japanese locale on Windows 10

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=47872

--- Comment #11 from Esme  ---
It turns out font substitution is not detected by GetFaceName. It's determined
later in GdipCreateFontFamilyFromName, using EnumFontFamilies.

I see this is in the gdi32 tests under test_EnumFonts_subst, but it only tests
that the resulting font isn't "MS Shell Dlg".

Is there any value in testing the actual fonts, or is it good enough to test
that gdiplus successfully returns with a different font name?