v20220206

Works for llvm-9 too, some smaller improvements and style changes.

v20211208

Includes a minor fix to avoid an error when using it for the first time.

v20200712

Rewrite from the old way of manipulating /usr/bin symlinks, to instead
adapting the PATH variable via files in /etc/env.d.

v20200711

First release of eselect-clang. Single compressed module file.