Make the rest of commands work from a subdirectory.

These commands are converted to run from a subdirectory.

    commit-tree convert-objects merge-base merge-index mktag
    pack-objects pack-redundant prune-packed read-tree tar-tree
    unpack-file unpack-objects update-server-info write-tree

Signed-off-by: Junio C Hamano <junkio@cox.net>

unpack-objects.c

@@ -269,6 +269,8 @@ int main(int argc, char **argv)
 	int i;
 	unsigned char sha1[20];
 
+	setup_git_directory();
+
 	for (i = 1 ; i < argc; i++) {
 		const char *arg = argv[i];