drawtext filter doesn't work with fontconfig

[Lirk88]

It works properly with ffmpeg-4.3.2-2021-02-02-full_build version, but doesn't with version ffmpeg-7.0-full_build. Also, the last version doesn't generate fontconfig cache in %LOCALAPPDATA% and it works only with fontfile parameter (e.g. fontfile=/Windows/Fonts/arial.ttf).