Extend wav2flac to support -c compression mode

[nigels-com]

Note: This is my first hands-on with golang, not 100% I'm doing it 100% correctly.

I'd come across mewkiz/flac PR #76 and plumbed wav2flac to have an opt-in for that.

Seems like it's working:

$ /usr/bin/time -v  go run main.go -f -c sample.wav  2>&1 | grep time
        Command being timed: "go run main.go -f -c sample.wav"
        User time (seconds): 10.95
        System time (seconds): 11.00
        Elapsed (wall clock) time (h:mm:ss or m:ss): 0:20.59

$ flac -t sample.flac 

flac 1.4.3
Copyright (C) 2000-2009  Josh Coalson, 2011-2023  Xiph.Org Foundation
flac comes with ABSOLUTELY NO WARRANTY.  This is free software, and you are
welcome to redistribute it under certain conditions.  Type `flac' for details.

sample.flac: ok                    

$ file sample.wav sample.flac
sample.wav:  RIFF (little-endian) data, WAVE audio
sample.flac: FLAC audio bitstream data, 24 bit, stereo, 96 kHz, 25383680 samples

$ ls -lah sample.wav sample.flac 
-rwxr-xr-x 1 nigels nigels 132M Dec 31 11:47 sample.flac
-rwxr-xr-x 1 nigels nigels 146M Dec 31 11:47 sample.wav

Also updated go.mod to use github.com/mewkiz/flac v1.0.13

[nigels-com]

See also: mewkiz/flac Issue #37