Log Message:
(pkgsrc)
 - patch-aa was used to edit Makefile. Now it edits Makefile.in instead
 - patch-a[cefh] are removed, equivalent fix applied
 - patch-dns.c  is added to silent prototype warning

(upstream)
 - Update 1.20 to 1.23
-------------------
1.23: Feb.17,2015:
        dns.c, smtp.c:
                typo fixed: INET6 should be AF_INET6

1.22: Jun.9,2012:
        smtp.c:
                logging whole message in multi-lined SMTP response.

1.21: Jun.7,2012:
        smtp.c, common.h, main.c:
                '-2' option added to avoid piggybacking among domains.
                (to support spec change on GoogleApps service)
        dns.c:
                definitions of functions with "static" are moved outside
                to avoid "invalid strage class" errors.
        *.c, extern.h:
                log() is renamed to logg() to avoid conflict.