cairo 1.16.0, in cairo_ft_apply_variations() in cairo-ft-font.c, would free memory using a free function incompatible with WebKit's fastMalloc, leading to an application crash with a "free(): invalid pointer" error.Referenceshttps://bugs.webkit.org/show_bug.cgi?id=191595https://gitlab.freedesktop.org/cairo/cairo/merge_requests/5
