Allow to build with the PyPI package "clang" instead of "libclang". 1. It seems to be maintained. 2. In the FreeBSD base system there is no pre-built libclang.so. If you need this library you have to install llvm from ports additionally. 2. On FreeBSD there is no pre-built wheel "libclang" with a packaged libclang.so.

See https://curl.haxx.se/changes.html for the edited and human readable online
version of what has changed over the years in different curl releases.

Generate a CHANGES file like the one present in every release like this:

$ git log --pretty=fuller --no-color --date=short --decorate=full | \
  ./scripts/log2changes.pl