security/libgcrypt: Update to 1.8.5

• Pet portlint

Noteworthy changes in version 1.8.5

• Bug fixes:
  • Add mitigation against an ECDSA timing attack. [T4626,CVE-2019-13627]
  • Improve ECDSA unblinding.

• Other features:
  • Provide a pkg-config file for libgcrypt.

Release-info: https://dev.gnupg.org/T4683

For further details, see https://lists.gnupg.org/pipermail/gnupg-announce/2019q3/000440.html

MFH: 2019Q3
Security: http://vuxml.freebsd.org/freebsd/c9c6c2f8-cd54-11e9-af89-080027ef1a23.html