#108 OSS plugin should support 24 and 32 bit formats

Modern OSS (version 4) has support for 24 and 32 bit formats [1]. Alsa's OSS emulation also supports them since 2.6.24 [2]. FreeBSD's OSS implementation supported them since 2005[3]. It would be nice if SoX would follow and support these formats as well.

[1] http://manuals.opensound.com/developer/formats.html

[2] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blobdiff;f=sound/core/oss/pcm_oss.c;h=c058713dd567b5d4bf7aab73e8d484a5c8b7c919;hp=fc11572c48cf8038b52d329f9aa12d7ec047f9ca;hb=24038a25e707fe08ff343d72dd667acefcc50f6f;hpb=100eb7c2843dec83a7d16cf6412ade6cb928d11d

Unfortunately, they didn't update soundcard.h, but since the values are known, oss.c can define them as well. #ifndef AFMT_S24_LE #define ... etc.

[3] http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/sys/soundcard.h.diff?r1=1.44;r2=1.45