Harfbuzz, libgpg-error, libvpx, Nettle, GnuTLS updates

The following projects have been updated:

• ffmpeg was updated to 4.4.r101753.
• Harfbuzz was updated to 2.8.0.
• libgpg-error was updated to 1.42.
• libvpx was updated to 1.10.0.
• Nettle was updated to 2.7.2.
• GnuTLS was updated to 3.7.1.

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.