www/h2o: Fix Use-after-free vulnerability

• Fix duplicate PORTREVISION assignment
• Register OpenSSL dependency when LIBRESSL is OFF

PR: 215587
Submitted by: Dave Cottlehuber <dch@skunkwerks.at> (maintainer)
MFH: 2016Q4
Security: d0b12952-cb86-11e6-906f-0cc47a065786
Security: CVE-2016-7835