avcodec/allcodecs: Remove LIBX264_CONST

Possible since 71669f2ad5.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/allcodecs.c

@@ -28,7 +28,6 @@
 #include <string.h>
 
 #include "config.h"
-#include "config_components.h"
 #include "libavutil/thread.h"
 #include "codec.h"
 #include "codec_id.h"
@@ -805,15 +804,7 @@ extern const FFCodec ff_libvpx_vp9_decoder;
 extern const FFCodec ff_libwebp_anim_encoder;
 extern const FFCodec ff_libwebp_encoder;
 extern const FFCodec ff_libx262_encoder;
-#if CONFIG_LIBX264_ENCODER
-#include <x264.h>
-#if X264_BUILD < 153
-#define LIBX264_CONST
-#else
-#define LIBX264_CONST const
-#endif
-extern LIBX264_CONST FFCodec ff_libx264_encoder;
-#endif
+extern const FFCodec ff_libx264_encoder;
 extern const FFCodec ff_libx264rgb_encoder;
 extern FFCodec ff_libx265_encoder;
 extern const FFCodec ff_libxeve_encoder;