fcgi-client: remove state READ_END
fcgi-client: remove state READ_END

This state was never used correctly, and is not necessary.  Eliminate
some dead codde that was never called.

CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy