Fix for C23.

--- xvidcore/src/encoder.h	2019-12-28 14:19:24.000000000 +0000
+++ xvidcore/src/encoder.h	2025-07-05 01:57:23.886577329 +0100
@@ -39,12 +39,6 @@
 #define LAMBDA_EXP		6
 
 /*****************************************************************************
- * Types
- ****************************************************************************/
-
-typedef int bool;
-
-/*****************************************************************************
  * Structures
  ****************************************************************************/