Alter the manpages install target to handle optional compression
Alter the manpages install target to handle optional compression

Break the install target for the manpages up such that it depends on a
separate target named install-manpages to copy the files into place.
The install target will then perform compression based on the autoconf
COMPRESS_MANPAGES substitution.

Signed-off-by: Ben Walton <6f9de98cc1f3d6d6e7da9953ca2250e07ad38e43@artsci.utoronto.ca>

rkorzeniewski/bacula,rkorzeniewski/bacula,rkorzeniewski/bacula,rkorzeniewski/bacula,rkorzeniewski/bacula,rkorzeniewski/bacula,rkorzeniewski/bacula,rkorzeniewski/bacula