MFH: r419706

Update to 2.0.5.

See https://www.wireshark.org/docs/relnotes/wireshark-2.0.5.html for
the list of changes in this release.

While here, enable DECRYPT support by default [1].

Requested by: oshogbo
Approved by: ports-secteam (with hat)
Security: CVE-2016-6505
Security: CVE-2016-6506
Security: CVE-2016-6508
Security: CVE-2016-6509
Security: CVE-2016-6510
Security: CVE-2016-6511
Security: CVE-2016-6512
Security: CVE-2016-6513
Security: https://vuxml.FreeBSD.org/freebsd/610101ea-5b6a-11e6-b334-002590263bf5.html