Follow-up to 6d972c8b1c which missed updating this directory name.
Also no longer call it crustls in the docs and bump to rusttls-ffi 0.7.1
Closes#7311
It also includes a few changes to get the builds going:
- Added autoconf to common dependencies
- Added automake to common dependencies
- Added libtool to common dependencies
- Added libssl-dev to common dependencies
Co-authored-by: Albin Vass
Closes#7245