Minor fixes for Haiku

* lisp/frame.el (display-symbol-keys-p):
* lisp/simple.el (normal-erase-is-backspace-setup-frame): Add
support for Haiku.

lisp/frame.el

@@ -2189,7 +2189,7 @@ frame's display)."
 This means that, for example, DISPLAY can differentiate between
 the keybinding RET and [return]."
   (let ((frame-type (framep-on-display display)))
-    (or (memq frame-type '(x w32 ns pc pgtk))
+    (or (memq frame-type '(x w32 ns pc pgtk haiku))
         ;; MS-DOS and MS-Windows terminals have built-in support for
         ;; function (symbol) keys
         (memq system-type '(ms-dos windows-nt)))))

lisp/simple.el

@@ -10386,7 +10386,7 @@ call `normal-erase-is-backspace-mode' (which see) instead."
        (if (if (eq normal-erase-is-backspace 'maybe)
                (and (not noninteractive)
                     (or (memq system-type '(ms-dos windows-nt))
-			(memq window-system '(w32 ns pgtk))
+			(memq window-system '(w32 ns pgtk haiku))
                         (and (eq window-system 'x)
                              (fboundp 'x-backspace-delete-keys-p)
                              (x-backspace-delete-keys-p))