pkgbase: Add an src.conf option for splitting man pages
Man pages can be big in total, add an options to split man pages
in -man packages so we produce smaller packages.
This is useful for small jails or mfsroot produced of pkgbase.
The option is off by default.
Reviewed by: bapt, Mina Galić <email@example.com>
Differential Revision: https://reviews.freebsd.org/D29169
MFC after: 2 weeks