Add toolbar button and Action menu item to toggle forcing the recompiler to interpret blocks, should help with some slowdowns (tested to help with Daggerfall on both recompilers and Legend of Hero III on new recompiler).

src/unix/unix.c

@@ -1731,3 +1731,9 @@ ui_hard_reset_completed(void)
 {
     /* No-op. */
 }
+
+void
+ui_update_force_interpreter(void)
+{
+    /* No-op. */
+}