Fix multiple vulnerabilities in file(1) and libmagic(3).

Security:	FreeBSD-SA-14:28.file
Security:	CVE-2014-3710, CVE-2014-8116, CVE-2014-8117

Fix BIND remote denial of service vulnerability.

Security:	FreeBSD-SA-14:29.bind
Security:	CVE-2014-8500

Approved by:	so
Merge remote-tracking branch 'freebsd/releng/9.3' into masters/releng/9.3