MFH: r450936

Update to 0.18.5
This addresses CVE-2017-14265, CVE-2017-14348, and CVE-2017-14608
Use FreeBSD libc strnlen and strcasestr functions instead of bundled [1]

PR: 219029 [1]
Submitted by: mi [1]
Security: 4cd857d9-26d2-4417-b765-69701938f9e0
Security: d9f96741-47bd-4426-9aba-8736c0971b24
Security: 02bee9ae-c5d1-409b-8a79-983a88861509

Approved by: ports-secteam (swills)