* sysdeps/mach/hurd/Makefile: Undo last change.
[$(subdir) = mach] (lib-noranlib): Depend on libmachuser-link.so.
[$(subdir) = hurd] (lib-noranlib): Depend on libhurduser-link.so.
* mach/Machrules (+preinit, +postinit, +interp,
LDFLAGS-$(interface.so)): Variables removed. Interface libraries get
linked just like other shared libraries.
(interface.so): Fix typo in defn, so it works.
($(objpfx)$(interface.so)): Make it depend on libc.so.