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js: Rename update_undo_redo() as post_move()

I want to do more things with it.

--- a/emcc.c

+++ b/emcc.c

@@ -244,7 +244,7 @@

  * and redo buttons get properly enabled and disabled after every move

  * or undo or new-game event.

  */

-static void update_undo_redo(void)

+static void post_move(void)

 {

     js_enable_undo_redo(midend_can_undo(me), midend_can_redo(me));

 }

@@ -259,7 +259,7 @@

     button = (button == 0 ? LEFT_BUTTON :

               button == 1 ? MIDDLE_BUTTON : RIGHT_BUTTON);

     midend_process_key(me, x, y, button, &handled);

-    update_undo_redo();

+    post_move();

     return handled;

 }

@@ -270,7 +270,7 @@

     button = (button == 0 ? LEFT_RELEASE :

               button == 1 ? MIDDLE_RELEASE : RIGHT_RELEASE);

     midend_process_key(me, x, y, button, &handled);

-    update_undo_redo();

+    post_move();

     return handled;

 }

@@ -281,7 +281,7 @@

     bool handled;

     midend_process_key(me, x, y, button, &handled);

-    update_undo_redo();

+    post_move();

     return handled;

 }

@@ -396,7 +396,7 @@

             keyevent |= MOD_NUM_KEYPAD;

         midend_process_key(me, 0, 0, keyevent, &handled);

-        update_undo_redo();

+        post_move();

         return handled;

     }

     return false; /* Event not handled, because we don't even recognise it. */

@@ -790,7 +790,7 @@

                 midend_new_game(me);

                 resize();

                 midend_redraw(me);

-                update_undo_redo();

+                post_move();

                 js_focus_canvas();

                 select_appropriate_preset();

             }

@@ -798,30 +798,30 @@

         break;

       case 3:                          /* OK clicked in a config box */

         cfg_end(true);

-        update_undo_redo();

+        post_move();

         break;

       case 4:                          /* Cancel clicked in a config box */

         cfg_end(false);

-        update_undo_redo();

+        post_move();

         break;

       case 5:                          /* New Game */

         midend_process_key(me, 0, 0, UI_NEWGAME, NULL);

-        update_undo_redo();

+        post_move();

         js_focus_canvas();

         break;

       case 6:                          /* Restart */

         midend_restart_game(me);

-        update_undo_redo();

+        post_move();

         js_focus_canvas();

         break;

       case 7:                          /* Undo */

         midend_process_key(me, 0, 0, UI_UNDO, NULL);

-        update_undo_redo();

+        post_move();

         js_focus_canvas();

         break;

       case 8:                          /* Redo */

         midend_process_key(me, 0, 0, UI_REDO, NULL);

-        update_undo_redo();

+        post_move();

         js_focus_canvas();

         break;

       case 9:                          /* Solve */

@@ -830,7 +830,7 @@

             if (msg)

                 js_error_box(msg);

         }

-        update_undo_redo();

+        post_move();

         js_focus_canvas();

         break;

     }

@@ -915,7 +915,7 @@

         resize();

         midend_redraw(me);

         update_permalinks();

-        update_undo_redo();

+        post_move();

     }

 }

@@ -1026,7 +1026,7 @@

      */

     midend_redraw(me);

     update_permalinks();

-    update_undo_redo();

+    post_move();

     /*

      * If we were given an erroneous game ID in argv[1], now's the