Fix regression error in r29666 for non-english locales that was causing a  KeyError when svnmerge.py commands were executed, since the output of svn  info was non-english and therefore non-parseable.
Fix regression error in r29666 for non-english locales that was causing a 
KeyError when svnmerge.py commands were executed, since the output of svn 
info was non-english and therefore non-parseable.

* contrib/client-side/svnmerge.py: Set the environment in which the script
    operates to set LC_MESSAGES = C (to force svn messages, such as those
    for svn info to be in english, and thus parseable by svnmerge.py), while
    also removing any pre-existing setting for LC_ALL (since setting LC_ALL 
    to C causes log output to not be internationalized).

Patch by:  me
           Laurent Petit <laurent.petit@gmail.com>
Review by: Giovanni Bajo <rasky@develer.com>
Found by:  Hernán Martínez Foffani <hernan.martinez@ecc.es>


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@869889 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion