security/putty: update to 0.78~pre20220922

This permits a FreeBSD build without patches; the two remaining
items are 1. avoiding the GSSAPI-related call into pkg-config because it
would not cover base-GSSAPI so we force the fallback to krb5-config
(which we control by way of ports/Mk/Uses/gssapi.mk), and

2. making sure PuTTY's build would not ascend directory hierarchy to

pick up our ports tree's Git information. We are only packaging
(pre-)release tarballs where we do not need to run Git.

Thanks to Simon Tatham, upstream maintainer, for issuing the
pre-releases and being very responsive and open to making the
build experience smooth for everyone.