Fontconfig, harfbuzz, fdk-aac, libdvdcss, libxml2, vorbis updates

The following projects have been updated:

• Fontconfig was updated to 2.13.0.
• Harfbuzz was updated to 1.7.6.
• libxml2 was updated to 2.9.8.
• Vorbis was updated to 1.3.6.
• fdk-aac was updated to 0.1.6.
• libdvdcss was updated to 1.4.2.

Any projects that have a dependency that was updated has also been updated to build with the latest versions of the new libraries as well.