fix BEEP PCM LSB+MSB 3
@@ -414,7 +414,7 @@ static void IOOUTCALL pit_o77(UINT port, REG8 dat) {
break;
case 0x30:
beep_mode_bit = 2;
-#if !defined(__LIBRETRO__) && !defined(MSC_VER)
+#if !defined(__LIBRETRO__) && !defined(_MSC_VER)
beep_mode_freq = 112;
#else
beep_mode_freq = 56;
