gnu/153945: Update sort with 15 upstream patches

[pfg at FreeBSD.org]

Synopsis: Update sort with 15 upstream patches

State-Changed-From-To: closed->open
State-Changed-By: pfg
State-Changed-When: Thu Mar 15 14:32:19 UTC 2012
State-Changed-Why: 
re-open: It seems like our gnu-sort has aged already too much and
although there is work being done in a proper replacement, some
updates should be considered as a stop gap measure.

http://www.freebsd.org/cgi/query-pr.cgi?pr=153945