Bison opportunistically enables libtextstyle and libreadline support
if they're installed on the build host. Since textstyle and readline
aren't part of uninative avoid host contamination by making their
support configurable and disabled by default in the native case.
Signed-off-by: Daniel McGregor <daniel.mcgregor@vecima.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
