switch source tree from k&r to c99

win/win32/mhmsgwnd.c

@@ -66,7 +66,7 @@ extern void play_sound_for_message(const char *str);
 #endif
 
 HWND
-mswin_init_message_window()
+mswin_init_message_window(void)
 {
     static int run_once = 0;
     HWND ret;
@@ -116,7 +116,7 @@ mswin_init_message_window()
 }
 
 void
-register_message_window_class()
+register_message_window_class(void)
 {
     WNDCLASS wcex;
     ZeroMemory(&wcex, sizeof(wcex));