Update the KERB_GSSAPI patch from debian.

https://sources.debian.org/data/main/o/openssh/1:7.7p1-2/debian/patches/gssapi.patch
is mirrored due to not being filename-unique and not gzipped.

PR: 226789
Submitted by: Rick Miller <vmiller@verisign.com> (based on)
Tested by: Rick Miller <vmiller@verisign.com>
Reported by: david@dcrosstech.com