fix perl5.18 build

PR:		ports/182840
Submitted by:	alexey <alexey@kouznetsov.com>
Approved by:	bapt (mentor)


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@369707 35697150-7ecd-e111-bb59-0022644237b5
- Convert to USES=autoreconf
- Remove :build from USES=libtool because this port does not need
  /usr/local/bin/libtool


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@369708 35697150-7ecd-e111-bb59-0022644237b5
net-mgmt/nagios4: Unbreak on DF (no-op for FreeBSD)


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@369709 35697150-7ecd-e111-bb59-0022644237b5
japanese/slrn is not jobs safe

It can try to use config.h before it's generated.


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@369710 35697150-7ecd-e111-bb59-0022644237b5
- Convert to USES=autoreconf
- Remove USES=libtool:build because this port does not use libtool


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@369711 35697150-7ecd-e111-bb59-0022644237b5