git-svn: fix a sloppy Getopt::Long usage

Getopt-Long v2.38 is much stricter about sloppy getopt usage. The
trailing pipe causes git-svn testcases to fail for all of the --stdin
argument calls.

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-svn.perl

@@ -133,7 +133,7 @@ BEGIN
 			%cmt_opts, %fc_opts } ],
 	'set-tree' => [ \&cmd_set_tree,
 	                "Set an SVN repository to a git tree-ish",
-			{ 'stdin|' => \$_stdin, %cmt_opts, %fc_opts, } ],
+			{ 'stdin' => \$_stdin, %cmt_opts, %fc_opts, } ],
 	'create-ignore' => [ \&cmd_create_ignore,
 			     'Create a .gitignore per svn:ignore',
 			     { 'revision|r=i' => \$_revision