libselinux: disable filespec hash table stats on non-debug builds

Disable generating filespec hash table stats on non-debug builds,
as they are not useful information for users and cause fixfiles
check to produce noisy output.

Reported-by: Alan Jenkins <alan.christopher.jenkins@gmail.com>
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
1 file changed