sndfile-convert.c : Add ability to specify endian-ness.
sndfile-convert.c : Add ability to specify endian-ness.

At the request of Jim Gray, allow endian-ness of output file to be
specified on the command line as:

    -endian=(little|big|cpu)

This is done before the call to sf_format_check() and may still
result in an error if the destination format does not support
the specified endian-ness.

evpobr/libsndfile,greearb/libsndfile-ct,RonNovy/libsndfile,libsndfile/libsndfile,RonNovy/libsndfile,evpobr/libsndfile,RonNovy/libsndfile,evpobr/libsndfile,syb0rg/libsndfile,evpobr/libsndfile,erikd/libsndfile,Icenowy/libsndfile,greearb/libsndfile-ct,Icenowy/libsndfile,erikd/libsndfile,Icenowy/libsndfile,audiokit/libsndfile,erikd/libsndfile,erikd/libsndfile,syb0rg/libsndfile,audiokit/libsndfile,greearb/libsndfile-ct,syb0rg/libsndfile,libsndfile/libsndfile,audiokit/libsndfile,Icenowy/libsndfile,greearb/libsndfile-ct,syb0rg/libsndfile,libsndfile/libsndfile,erikd/libsndfile,libsndfile/libsndfile,evpobr/libsndfile,greearb/libsndfile-ct,libsndfile/libsndfile,RonNovy/libsndfile,Icenowy/libsndfile,audiokit/libsndfile