Drop duplicate code that LLVM 22 no longer accepts.

Index: converter/other/jpeg2000/libjasper_compat.c
--- converter/other/jpeg2000/libjasper_compat.c.orig
+++ converter/other/jpeg2000/libjasper_compat.c
@@ -3,7 +3,7 @@
 #include "jasper/jasper.h"
 #include "jasper/jas_image.h"
 
-#ifndef JAS_HAVE_PMJAS_IMAGE_DECODE
+#if 0
 
 void
 pmjas_image_decode(jas_stream_t * const in,
