kbuild: Unset language specific variables in setlocalversion script

This patch allows the use of setlocalversion script regardless of the language
parameters. Otherwise, the `svn info 2>/dev/null | grep '^Last Changed Rev'`
returns nothing because for instance, in French the text 'Last Changed Rev'
is replaced by 'Révision de la dernière modification'
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michal Marek <mmarek@suse.cz>

scripts/setlocalversion

@@ -108,7 +108,7 @@ scm_version()
 	fi
 
 	# Check for svn and a svn repo.
-	if rev=`svn info 2>/dev/null | grep '^Last Changed Rev'`; then
+	if rev=`LANG= LC_ALL= LC_MESSAGES=C svn info 2>/dev/null | grep '^Last Changed Rev'`; then
 		rev=`echo $rev | awk '{print $NF}'`
 		printf -- '-svn%s' "$rev"