x11-fonts/fontconfig: Restore generation of font cache
Restore generation of cache prior to Meson switch
Upstream patch provided by John Hein
PR: 254963
Reported by: Piotr Smyrak
Tested by: Piotr Smyrak and John Hein
Approved by: arrowd (mentor)
Obtained from: https://gitlab.freedesktop.org/fontconfig/fontconfig/-/issues/296
Differential Revision: https://reviews.freebsd.org/D31602