Log Message:
Updated fontconfig to 2.12.0.

Here is the announcement for the stable release after 2 years, which
many features and bug fixes contains.

Summary of the changes since last stable release is:
- - Support the size specific design selection in OS/2 table version 5
- - Allow the modification on 'lang' and 'charset' objects
- - Increase the refcount in FcConfigSetCurrent()
- - some updates in orth files
- - Add --error-on-no-fonts option to fc-cache
- - Use lang=und instead of lang=xx for "undetermined"
- - Add FC_WEIGHT_DEMILIGHT and change from 65 to 55
- - Add FC_COLOR
- - Treat color fonts as scalable
- - no FC_LANG added with FcConfigSubstitute() when it has "und"
- - Hardcode blanks in library
- - Support symbol fonts
- - Unicode 8.0 support
- - Add hintstyle templates and default hintslight
- - GX font support
- - Improve the footprint issue on updating caches
- - Bump the cache version to 6
- - more bug fixes
- - and more...