Add libsamplerate support, old resampling is still an option, but this sounds much better for those who need it and don't want to use pulseaudio. Reviewed by shank/avuton.

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correctly.

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size_t (1.1.3) makes a lot more sense, but older flac used unsigned
here...

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just casting to int because it's the simplest (%z is not
well-supported)

Noticed-by: avuton on a 64-bit machine

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I'm an idiot for not noticing that :x

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We don't need to check for libOggFLAC with FLAC 1.1.3
because FLAC 1.1.3 can be recompiled to enable/disable
OggFLAC support without recompiling mpd.

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Some compilers and linkers aren't smart enough to optimize this,
as global variables are implictly initialized to zero.  As a
result, binaries are a bit smaller as more goes in the .bss and
less in the text section.

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We'll be dealing with legacy server configurations for a long
time to come.

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There's no reason they shouldn't be static.  Additionally,
output_ports doesn't need to be initialized to NULLs; that is
(and has always been) implicit (for all global variables)

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sendDataToOutputBuffer returns an int (and always has), and
using the existing 'ret' is fine in mp3Read().

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just added the missing includes.

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FLAC__{seekable_,}_stream_decoder_new() takes no arguments

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-a and -o flags for 'test' are not consistently supported
across many platforms and not specified by POSIX

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warning messages.

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for log messages when outputting to console.

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