clone: Quote user supplied path in a single quote pair

Without this patch,

    $ git clone foo .

results in this:

    Cloning into ....
    done.

With it:

    Cloning into '.'...
    done.

Signed-off-by: Richard Hartmann <richih.mailinglist@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/clone.c

@@ -577,9 +577,9 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 
 	if (0 <= option_verbosity) {
 		if (option_bare)
-			printf(_("Cloning into bare repository %s...\n"), dir);
+			printf(_("Cloning into bare repository '%s'...\n"), dir);
 		else
-			printf(_("Cloning into %s...\n"), dir);
+			printf(_("Cloning into '%s'...\n"), dir);
 	}
 	init_db(option_template, INIT_DB_QUIET);
 	write_config(&option_config);