Update ports/dns/samba-nsupdate to 9.13.3

[cy]

Summary

Update ports/dns/samba-nsupdate to 9.13.3. This addresses openssl111 issues in FreeBSD-12 and FreeBSD-13. This also allows the "make Heimdal in base" project to continue without having to update the port in that project.

Test Plan

builds succeeded in FreeBSD 13-CURRENT with Heimdal or MIT krb5 ports installed (both tested) and using Heimdal in base.

[timur]

I've committed somewhat joint result of the given patches and https://reviews.freebsd.org/D16878.

https://svnweb.freebsd.org/ports?view=revision&revision=485128

[cy]

Thanks for committing this.