Nothing ever sets HAVE_STDBOOL_H in transcode.

--- transcode-1.1.7/filter/yuvdenoise/mjpeg_types.h	2011-11-19 16:50:23.000000000 +0000
+++ transcode-1.1.7/filter/yuvdenoise/mjpeg_types.h	2025-07-07 12:35:33.952275761 +0100
@@ -38,23 +38,7 @@
 #include <stdint.h>
 #include <sys/types.h>
 
-#if defined(HAVE_STDBOOL_H) && !defined(__cplusplus)
 #include <stdbool.h>
-#else
-/* ISO/IEC 9899:1999 <stdbool.h> missing -- enabling workaround */
-
-# ifndef __cplusplus
-typedef enum
-  {
-    false = 0,
-    true = 1
-  } locBool;
-
-#  define false   false
-#  define true    true
-#  define bool locBool
-# endif
-#endif
 
 #ifndef PRId64
 #define PRId64 PRID64_STRING_FORMAT