security/openssh-portable: Add KERB_GSSAPI patch for 10.0p1

This patch unbreaks the gssapi flavor.
Bumped PORTREVISION.

Sponsored by: Klara, Inc.
Approved by: 0mp (mentor)
Approved by: portmgr (blanket)
Differential Revision: https://reviews.freebsd.org/D50484