Fixes double byte character GetCharABCWidthFloat returns null

I've tried to use russian characters (>1000 character region) - and realized GetCharABCWidthsFloat doesn't work for it, which results in terrible text rendered. Quick search - found only this http://forums.codeguru.com/showthread.php?367916-Get-character-width. Strangely (or maybe it makes sense), Unicode version of this function fixes it.