Get rid of the last remnants of GIT_CONFIG_LOCAL

In dc871831(Only use GIT_CONFIG in "git config", not other programs),
GIT_CONFIG_LOCAL was rested in peace, in favor of not reading
/etc/gitconfig and $HOME/.gitconfig at all when GIT_CONFIG is set.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/git-svn.perl b/git-svn.perl
index 2c206e9..ad01e18 100755
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -5015,8 +5015,7 @@
 		}
 	}
 	if (@emptied) {
-		my $file = $ENV{GIT_CONFIG} || $ENV{GIT_CONFIG_LOCAL} ||
-		           "$ENV{GIT_DIR}/config";
+		my $file = $ENV{GIT_CONFIG} || "$ENV{GIT_DIR}/config";
 		print STDERR <<EOF;
 The following [svn-remote] sections in your config file ($file) are empty
 and can be safely removed: