libreadline has been relicensed to GPLv3 and thus incompatible to
xfsprogs many years ago, and all the distros have dropped or are
in the stages of dropping the last GPLv2 version. As the BSD
licensed libeditline provides the same functionality there is no
need to keep the obsolete libreadline support around.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Eric Sandeen <sandeen@sandeen.net>