Include the most specific header documented by MSDN instead.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

The ChainFilter class is extremely complicated code, and will grow to
be even more complicated when the Filter interface gets extended.
Let's just remove it; we can easily chain many TwoFilters instead.

release v0.22.11

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1233

Insert an "aformat" filter which converts double-precision to
single-precision.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1235

If DetectFilterOutputFormat() fails to determine the output format,
insert an "aformat" filter which attempts to force a specific output
format.

Fixes part 2 of of https://github.com/MusicPlayerDaemon/MPD/issues/1235

Merge some duplicate code.

Since AVFilterContext are freed automatically, this wrapper class
serves no purpose.  Let's remove it.

Fixes potential double-free bugs which currently did not occur because
the destructors happened to be called in the right order.

Fixes part 1 of https://github.com/MusicPlayerDaemon/MPD/issues/1235