Convert Free_Pixmap macro into terminal hook

* src/termhooks.h (terminal) [HAVE_WINDOW_SYSTEM]: New terminal hook
free_pixmap.

* src/image.c: Replace Free_Pixmap with free_pixmap.

* src/msdos.h (FRAME_X_DISPLAY):
* src/nsgui.h (Display):
* src/nsterm.h (FRAME_NS_DISPLAY, FRAME_X_DISPLAY, FRAME_X_SCREEN)
(FRAME_X_VISUAL):
* src/w32term.h (FRAME_X_DISPLAY): Remove unused X-compatibility
macros and typedefs.

* src/nsterm.m:
* src/w32term.c:
* src/xterm.c: Implement and set free_pixmap hook.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/termhooks.h b/src/termhooks.h
index 54f09e03033..0962add0817 100644
--- a/src/termhooks.h
+++ b/src/termhooks.h
@@ -741,6 +741,15 @@ struct terminal
                                             const char *name,
                                             const char *class);
 
+  /* Image hooks */
+#ifdef HAVE_WINDOW_SYSTEM
+  /* Free the pixmap PIXMAP on F.  */
+  void (*free_pixmap) (struct frame *f, Pixmap pixmap);
+
+#endif
+
+  /* Deletion hooks */
+
   /* Called to delete the device-specific portions of a frame that is
      on this terminal device. */
   void (*delete_frame_hook) (struct frame *);