security/tor: update 0.3.0.7 -> 0.3.0.8

PR: 219863
Submitted by: Yuri Victorovich <yuri@rawbw.com> (maintainer)
MFH: 2017Q2
Relnotes: https://gitweb.torproject.org/tor.git/plain/ReleaseNotes?id=tor-0.3.0.8
Security: CVE-2017-0375, CVE-2017-0376