Remove old version guards relating to USD versions prior to 2111 which
released in Nov 2021.
The oldest supported version of Blender, 3.3 LTS which goes end of life
this month, was already using USD version 2203 released in March 2022.
Additionally, these guards give the illusion that compiling with old
versions prior to 2111 might work, which is neither guaranteed nor
tested for at this point.
Pull Request: https://projects.blender.org/blender/blender/pulls/127380
cbdc7d7636