Harfbuzz, SDL, libgpg-error updates

The following projects have been updated:

• ffmpeg was updated to 4.5.r104645.
• Harfbuzz was updated to 3.1.0 then to 3.1.1.
• SDL was updated to 2.0.16.
• libgpg-error was updated to 1.43.

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.