omxil: enable extra debug in debug builds

This will enable more people to make useful reports.

To avoid spamming your log, several solutions:
- rebuild with this define removed
- use grep to match only what interests you from the log
- use software decoder

modules/codec/omxil/omxil.c

@@ -50,7 +50,9 @@
 
 #include "omxil.h"
 
-//#define OMXIL_EXTRA_DEBUG
+#ifndef NDEBUG
+# define OMXIL_EXTRA_DEBUG
+#endif
 
 #define SENTINEL_FLAG 0x10000