Harfbuzz, libxml2, x264, libdvdcss, libdvdnav updates

The following projects have been updated:

• ffmpeg was updated to 4.5.r102609.
• Harfbuzz was updated to 2.8.1.
• libxml2 was updated to 2.9.11 then to 2.9.12.
• x264 was updated to 0.163.r3059.
• libdvdcss was updated to 1.4.3.
• libdvdnav was updated to 6.1.1.

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.