Delete some Emacs 19/21 compat code

* lisp/erc/erc-goodies.el (erc-occur):
* lisp/net/newst-plainview.el (newsticker--buffer-redraw): Delete
Emacs 21 compat code.
* lisp/progmodes/sql.el (sql-accumulate-and-indent): Delete Emacs
19 compat code.

lisp/erc/erc-goodies.el

@@ -800,9 +800,7 @@ servers.  If called from a program, PROC specifies the server process."
    (list (read-string "Search for: ")
          (if current-prefix-arg
              nil erc-server-process)))
-  (if (fboundp 'multi-occur)
-      (multi-occur (erc-buffer-list nil proc) string)
-    (error "`multi-occur' is not defined as a function")))
+  (multi-occur (erc-buffer-list nil proc) string))
 
 (provide 'erc-goodies)
 

lisp/net/newst-plainview.el

@@ -1175,9 +1175,7 @@ The mode-line is changed accordingly."
 
 (defun newsticker--buffer-redraw ()
   "Redraw the newsticker window."
-  (if (fboundp 'force-window-update)
-      (force-window-update (current-buffer))
-    (redraw-frame))
+  (force-window-update (current-buffer))
   (run-hooks 'newsticker-buffer-change-hook)
   (sit-for 0))
 

lisp/progmodes/sql.el

@@ -3096,9 +3096,7 @@ displayed."
 (defun sql-accumulate-and-indent ()
   "Continue SQL statement on the next line."
   (interactive)
-  (if (fboundp 'comint-accumulate)
-      (comint-accumulate)
-    (newline))
+  (comint-accumulate)
   (indent-according-to-mode))
 
 (defun sql-help-list-products (indent freep)