security/libressl: Update to 2.2.0

• Update to 2.2.0
• Remove opensslfeatures.h patch (included upstream)
• Add pkg-plist (mainly documentation)
• Bump libcrypto SHLIB version in Mk/bsd.openssl.mk

Changes:

http://marc.info/?l=openbsd-announce&m=143404058913441

Reviewed_by: vsevolod, koobs
Approved by: vsevolod (maintainer, mentor), koobs (mentor)
Security: 8305e215-1080-11e5-8ba2-000c2980a9f3
Differential revision: D2770
MFH: 2015Q2