bug#4070: 23.1; ns: cut buffers don't work with --daemon

[Dan Ports]

I'm using the Aqua (ns) port interface on OS X. After starting emacs
with --daemon and firing up an emacs client, it's unable to access the
cut buffers, causing killing/yanking to fail.

Specifically, ns-store-cut-buffer-internal fails silently, and
ns-get-cut-buffer-internal fails with the message "empty or
unsupported pasteboard type".

I'm guessing that some part of the ns interface isn't being
initialized properly when started headless, and presumably it's part
of the C code given that ns-{get/set}-cut-buffer-internal fail. But
this is already straining at the limits of my knowledge of emacs
internals.

In GNU Emacs 23.1.1 (i386-apple-darwin9.7.0, NS apple-appkit-949.46)
 of 2009-08-05 on ambulatory-clam.local
Windowing system distributor `Apple', version 10.3.949 configured using 
`configure  '--prefix=/opt/local' '--with-ns' 'CC=/usr/bin/gcc-4.0' 
'CFLAGS=-O2' 'LDFLAGS=-L/opt/local/lib' 'CPPFLAGS=-I/opt/local/include' 
'CPP=/usr/bin/cpp-4.0''