Do not depend on NDEBUG inside headers

If stats are too heavy weight to use w/o debug, we should either fix
them or remove them completely anyway

include/vlc_messages.h

@@ -306,17 +306,10 @@ VLC_EXPORT( void, __stats_ComputeGlobalStats, (vlc_object_t*,global_stats_t*));
 /*********
  * Timing
  ********/
-#ifndef NDEBUG
 #define stats_TimerStart(a,b,c) __stats_TimerStart( VLC_OBJECT(a), b,c )
 #define stats_TimerStop(a,b) __stats_TimerStop( VLC_OBJECT(a), b )
 #define stats_TimerDump(a,b) __stats_TimerDump( VLC_OBJECT(a), b )
 #define stats_TimersDumpAll(a) __stats_TimersDumpAll( VLC_OBJECT(a) )
-#else
-#define stats_TimerStart(a,b,c) (void)0
-#define stats_TimerStop(a,b) (void)0
-#define stats_TimerDump(a,b) (void)0
-#define stats_TimersDumpAll(a) (void)0
-#endif
 VLC_EXPORT( void,__stats_TimerStart, (vlc_object_t*, const char *, unsigned int ) );
 VLC_EXPORT( void,__stats_TimerStop, (vlc_object_t*, unsigned int) );
 VLC_EXPORT( void,__stats_TimerDump, (vlc_object_t*, unsigned int) );