pkg/51106: Update mail/opensmtpd to 5.7.3p2.

[ishit%oak.dti.ne.jp@localhost]

>Number:         51106
>Category:       pkg
>Synopsis:       Update mail/opensmtpd to 5.7.3p2.
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Sat Apr 30 18:15:00 +0000 2016
>Originator:     ISIHARA Takanori
>Release:        pkgsrc -current 2016/4/29
>Organization:
Nagoya *BSD Users' Group :-)
>Environment:
NetBSD ishitPc14.home 7.0_STABLE NetBSD 7.0_STABLE (ISHITPC14) #11: Sun Apr 17 11:40:55 JST 2016  sysbuild%ishitPc14.home@localhost:/opt/sysbuild/netbsd-7/obj/amd64/sys/arch/amd64/compile/ISHITPC14 amd64

and

Linux seri.rururu.org 2.6.32-042stab092.2 #1 SMP Tue Jul 8 10:35:55 MSK 2014 x86_64 x86_64 x86_64 GNU/Linux

>Description:
Update mail/opensmtpd to 5.7.3p2.
and requires new package net/libasr.

I used the URI below as reference. (Suggestion from twitter:@venture37.)
cf.http://pastebin.com/kiCDAveN

>How-To-Repeat:

>Fix:
cd /tmp
ftp http://www.rururu.org/~isihara/libasr.tar.gz
ftp http://www.rururu.org/~isihara/opensmtpd.tar.gz
cd /usr/pkgsrc/net
tar xzf /tmp/libasr.tar.gz
cd /usr/pkgsrc/mail
mv opensmtpd opensmtpd.old
tar xzf /tmp/opensmtpd.tar.gz
cd /usr/pkgsrc/mail/opensmtpd
make install