MPD 0.21.2 released

Music Player Daemon 0.21.2 has been released.

There are three crash bug fixes in the httpd plugin (related to the option always_on), the ALSA plugin uses less CPU with dmix, and the broken zlib support has been fixed. A bug in the FFmpeg plugin which caused broken sound was fixed.

In filter expressions, there are two new operators: one matches substrings, and one uses regular expressions.