Alexander Larsson authored May 23, 2018 and Akira TAGOH committed May 25, 2018

This changes the rewriting of the FC_FILE values for relocated caches to an earlier stage
while reading the cache. This is better, because it means all APIs will report the
rewritten paths, not just the once that use the list apis.

We do this by detecting the relocated case and duplicating the FcPattern and FcPatternElm
in an cache allocation (which will die with the cache) and then reusing the FcValueLists
from the cache.

This means that in the rewritten case we will use some more memory, but not the full
size of the cache. In a test here I had 800k of relocated caches, but ~200k of wasted
on duplicating the objects.

This should fix https://bugs.freedesktop.org/show_bug.cgi?id=106618