Update AOM, again #658

Explain the Feature/Enhancement

An aom update hardly just landed in StreamFX and already there's a new version out: libaom v3.2.0.

This version brings major improvements, namely speed 10 for even faster realtime encoding, and speed/efficiency improvements for speeds 5-9.

What makes this feature/enhancement useful for StreamFX and its users?

Faster AV1 encoding speed.

Checklist

• I am offering a monetary bounty/reward for the implementation of this Feature/Enhancement.
• There is no other way to currently do this in StreamFX or OBS Studio.

Any additional Information we need to know?

Release announcement: https://groups.google.com/a/aomedia.org/g/av1-discuss/c/xrpGhv1nr8w