include/share/endswap.h : Fix usage of HAVE_BSWAP16.
include/share/endswap.h : Fix usage of HAVE_BSWAP16.

The code was incorrectly using #ifndef on a value that was always defined
to a value of either 0 or 1.

waitman/flac,waitman/flac,waitman/flac,waitman/flac,waitman/flac