Rhosydd had been re-enabled in the target, but not in the SDK or devroot
where it had also previously been installed. Re-enable it on the SDK, but
just in 1 place, deleting the second. On the devroot, we should really
have the relevant library headers rather than rhosydd its self, so add
libcroesor-0-dev and librhosydd-0-dev to that image instead.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>