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.

HIDDEN
{
  local:
    __*;
    _rest*;
    _save*;
};

CURL_@CURL_LT_SHLIB_VERSIONED_FLAVOUR@4
{
  global: curl_*;
  local: *;
};