Do not allow font caches to grow too large.
* alloc.c (compact_font_cache_entry, compact_font_caches): New functions or stub if not HAVE_WINDOW_SYSTEM. (compact_undo_list): Factor out from Fgarbage_collect. Add comment. (mark_face_cache): Mark face font. Move down to avoid extra prototypes. (mark_terminals): Do not mark font cache here. (Fgarbage_collect): Call compaction functions described above. Adjust comment.
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