patch 7.4.1169

Problem:    The socket I/O is intertwined with the netbeans code.
Solution:   Start refactoring the netbeans communication to split off the
            socket I/O.  Add the +channel feature.

src/config.mk.in

@@ -89,6 +89,8 @@ WORKSHOP_OBJ	= @WORKSHOP_OBJ@
 
 NETBEANS_SRC	= @NETBEANS_SRC@
 NETBEANS_OBJ	= @NETBEANS_OBJ@
+CHANNEL_SRC	= @CHANNEL_SRC@
+CHANNEL_OBJ	= @CHANNEL_OBJ@
 
 RUBY		= @vi_cv_path_ruby@
 RUBY_SRC	= @RUBY_SRC@