I might change this convention again in the future, particularly once
someone wants to fund C89 conformance, but let's stay consistent for
now.
Part of P0264, funded by [Anonymous] and Blue Bolt.
The asymmetry of having to do this for TH05's resident structure but
not for TH04's has finally become annoying enough.
Part of P0263, funded by [Anonymous].
Having to comb through them and change their `#pragma option -zC` names
after adding a new one is pretty annoying, after all. This way, we also
get to move some of those 2020 decompilations out of the `th05/`
subdirectory, matching the more consistent directory hierarchy that
this project has converged on in the years since.
Part of P0261, funded by [Anonymous] and Yanga.