pcsound: Remove Win9x TODO().

We're not going to pretend to support Win9x any more so this isn't
going to get done. Part of #834.

pcsound/pcsound_win32.c

@@ -73,15 +73,11 @@ static int PCSound_Win32_Init(pcsound_callback_func callback_func)
 
     // Beep() ignores its arguments on win9x, so this driver will
     // not work there.
-
     if (osvi.dwPlatformId != VER_PLATFORM_WIN32_NT)
     {
-        // TODO: Use _out() to write directly to the PC speaker on
-        // win9x: See PC/winsound.c in the Python standard library.
-
         return 0;
     }
-    
+
     // Start a thread to play sound.
 
     callback = callback_func;