Remove more code mindlessly copied from NS

* src/pgtkfns.c (Fx_open_connection):
* src/pgtkselect.c (nxatoms_of_pgtkselect):
* src/pgtkselect.h:
* src/pgtkterm.h: Delete `nxatoms_of_pgtkselect'.

src/pgtkfns.c

@@ -2212,7 +2212,6 @@ terminate Emacs if we can't open the connection.  */)
 
   CHECK_STRING (display);
 
-  nxatoms_of_pgtkselect ();
   dpyinfo = pgtk_term_init (display, SSDATA (Vx_resource_name));
   if (dpyinfo == 0)
     {

src/pgtkselect.c

@@ -492,12 +492,6 @@ frame's display, or the first available display.  */)
   return Qnil;
 }
 
-
-void
-nxatoms_of_pgtkselect (void)
-{
-}
-
 void
 syms_of_pgtkselect (void)
 {

src/pgtkselect.h

@@ -26,8 +26,6 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 #include <gtk/gtk.h>
 
 extern void pgtk_selection_init (void);
-extern void pgtk_selection_lost (GtkWidget * widget,
-				 GdkEventSelection * event,
-				 gpointer user_data);
+extern void pgtk_selection_lost (GtkWidget *, GdkEventSelection *, gpointer);
 
 #endif /* HAVE_PGTK */

src/pgtkterm.h

@@ -611,9 +611,6 @@ extern void syms_of_pgtkmenu (void);
 extern void syms_of_pgtkselect (void);
 extern void syms_of_pgtkim (void);
 
-/* Implemented in pgtkselect. */
-extern void nxatoms_of_pgtkselect (void);
-
 /* Initialization and marking implemented in pgtkterm.c */
 extern void init_pgtkterm (void);
 extern void mark_pgtkterm (void);