Lots of patches have been either fully or partially implemented, and
have thus been dropped or reworked.

For macOS, the "macosx" config file is no more; only "macosx-bigsur",
"macosx-catalina", and "macosx-no-openssl". "macosx-bigsur" has been
chosen as the config, and all the sed commands have been fixed to
account for multiple macosx* files.

The library now uses ifaddrs.h unless NO_GETIFADDRS is defined. For
Windows, ifaddrs.h doesn't exist and thus is always needed. For Android,
it is available since API level 24.

The library also uses OpenSSL unless NO_OPENSSL is defined. This is
added to LIVE_EXTRA_CFLAGS, and the pkg-config file.