sndfile-tools 1.0.3 (new formula)

I see linkage to libsndfile, libjack, libfftw3 and libcairo:

```
$ otool -L $(brew --prefix sndfile-tools)/bin/*
/usr/local/opt/sndfile-tools/bin/sndfile-generate-chirp:
	/usr/local/lib/libsndfile.1.dylib (compatibility version 2.0.0, current version 2.25.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1213.0.0)
/usr/local/opt/sndfile-tools/bin/sndfile-jackplay:
	/usr/local/lib/libsndfile.1.dylib (compatibility version 2.0.0, current version 2.25.0)
	/usr/local/lib/libjack.0.dylib (compatibility version 1.0.0, current version 1.28.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1213.0.0)
	/System/Library/Frameworks/CoreAudio.framework/Versions/A/CoreAudio (compatibility version 1.0.0, current version 1.0.0)
	/System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices (compatibility version 1.0.0, current version 62.0.0)
	/System/Library/Frameworks/AudioUnit.framework/Versions/A/AudioUnit (compatibility version 1.0.0, current version 1.0.0)
/usr/local/opt/sndfile-tools/bin/sndfile-mix-to-mono:
	/usr/local/lib/libsndfile.1.dylib (compatibility version 2.0.0, current version 2.25.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1213.0.0)
/usr/local/opt/sndfile-tools/bin/sndfile-spectrogram:
	/usr/local/lib/libsndfile.1.dylib (compatibility version 2.0.0, current version 2.25.0)
	/usr/local/lib/libfftw3.3.dylib (compatibility version 8.0.0, current version 8.4.0)
	/usr/local/lib/libcairo.2.dylib (compatibility version 11403.0.0, current version 11403.0.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1213.0.0)
```