bin/190099: BSD sort - merge sort don't work for stdin

>Number:         190099
>Category:       bin
>Synopsis:       BSD sort - merge sort don't work for stdin
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Thu May 22 09:50:04 UTC 2014
>Closed-Date:
>Last-Modified:
>Originator:     Anton Yuzhaninov
>Release:        FreeBSD 10.0-STABLE-20140515 amd64
>Organization:
Openstat.ru
>Environment:
System: FreeBSD aleph.mgmt.vega.ru 10.0-STABLE-20140515 FreeBSD 10.0-STABLE-20140515 #0 r266115M: Thu May 15 07:47:52 UTC 2014 [e-mail]:/usr/obj/usr/src/sys/MGMT amd64

>Description:
	There is regression in BSD sort compared to GNU sort --merge option
	no longer works for stdin

	Upgrade from FreeBSD 8 to FreeBSD 10 caused breakage of our scripts
	where used constructions like:
	script_foo | sort ... | cut ... | sort -mu -k 1,1 | script_bar

>How-To-Repeat:

:~> cat ttt
key1    foo
key1    bar
key2    xzy
:~> cat ttt | sort -mu -k 1,1
:~>
:~> sort --version
2.3-FreeBSD

Expected result:

:~> cat ttt | sort -mu -k 1,1
key1    foo
key2    xzy
:~> sort --version
sort (GNU coreutils) 5.3.0-20040812-FreeBSD
Written by Mike Haertel and Paul Eggert.
....

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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