sysutils/fusefs-webdavfs: update to g20181010

• mount options: cookie and rwdirops;

• specify multiple licenses (BSD3CLAUSE, BSD4CLAUSE and MIT) for this multi-distfiles port;

• optimize post-patch target to look only for '*.go' files and recurse only to two needed directories; this prevents it from descending into .ccache directory mounted by poudriere+ccache inside WORKDIR. (*)

PR: 234099
Reported by: Kai <freebsd_ports@k-worx.org> (*)