textproc/expat2: address two CVEs reported by upstream PR: 210155 Reported by: Sebastian Pipping <sebastian@pipping.org> Approved by: ports-secteam (with hat) Security: CVE-2012-6702 Security: CVE-2016-5300 Security: https://vuxml.FreeBSD.org/freebsd/c9c252f5-2def-11e6-ae88-002590263bf5.html MFH: 2016Q2