Libgcrypt, Nettle, x264 updates

The following projects have been updated:

• ffmpeg was updated to 4.4.r101298.
• Libgcrypt was updated to 1.9.2.
• Nettle was updated to 2.7.1.
• x264 was updated to 0.161.r3048.

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.