ASAN reports memory leaks in libfontconfig

Hi, ALL,

I did report the memory leaks to libfontconfig in Making sure you're not a bot!.

I was told that most likely it is incorrectly used in (Pango?).

There was a comment, presumably from a maintainer of the library that if there is no call to clean up then its possible there is a leak.

The problem is that everytime I need to render something the number of leaks grows. And its really hard to find the leak inside my own program.

Thank you.