Reviewed by Darin.

        Change Makefiles to return non-zero when module make fails.

        * Makefile:

WebKitTools:        
        Change Makefiles to return non-zero when module make fails.
        Fix bug where if xcode options are not set, modules can build in the
        wrong directory.

        * Makefile:
        * Scripts/webkitdirs.pm:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@17447 268f45cc-cd09-0410-ab3c-d52691b4dbfc