patch lives within the base system on FreeBSD, no point in checking for its presence.
Merge pull request #1733 from jasiek/master

Checking for the existence of patch via a package manager is not necessary
NEXT: 1.19.1 with 1733
do not try port for smf osx requirements, fix #1736
NEXT: 1.19.1 with 1736
Merge branch 'master' of github.com:wayneeseguin/rvm