Make fontconfig cache relocatable
Submitted by Akira TAGOH
Assigned to Akira TAGOH
Current fontconfig caches are supposed to be matched one-by-one to fonts. when fonts has been moved somewhere or doing bind-mounts fonts directories somewhere else would causes rebuilding caches and can't share it on them (which is the main target this time).
This also affects the startup time for applications and caches should supports relocation without rebuilding.