net/ocserv: Update to 0.11.6

• Update PORTVERSION and distinfo checksum (0.11.6)
• Add LICENSE_FILE
• Cosmetic fixes
• Remove STRIP_CMD target since all binaries are installed with --strip (-s) option by default
• Silence two explicitly called commands

Changelog:

http://lists.infradead.org/pipermail/openconnect-devel/2016-November/004066.html

Reviewed by: amdmi3 (mentor)
Approved by: amdmi3 (mentor)
Differential Revision: D8538