Set thread stack size explicitly
Hi! Per https://gitlab.gnome.org/GNOME/librsvg/-/issues/595 , it is known that something should manually set the thread stack size for threads using pixman. This is the relevant comment.
Since librsvg
doesn't itself depend on pixman, and, more importantly, doesn't seem to create threads, I believe this responsibility should, instead, fall to Cairo, though I couldn't find exactly where it uses threads with pixman, so the issue might have manifested itself there because of a coincidence.