ceph.spec.in: remove build directory in %clean, not %install
Removing the build directory at the end of %install is too soon,
and means we get rid of a bunch of stuff needed to correctly
create debuginfo/debugsource packages, which happens automatically
right after %install. So, let's put it where it really belongs, in
the %clean section.
Fixes: aa18cb12003e3526c8e8f23dc2335a483fbfa68e Fixes: https://tracker.ceph.com/issues/55079 Signed-off-by: Tim Serong <tserong@suse.com>