DEBUG: Run debug code in debug builds, not release

SCTK_ALLOC_DEBUG was defined in release builds, not in
debug builds. It is now defined in debug builds only.

Author: rd-cea

src/sctk_alloc_debug.h

@@ -28,11 +28,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-//compat with NDEBUG system because using this has consequences in MPC sources.
-#ifdef NDEBUG
-#undef SCTK_ALLOC_DEBUG
+#ifndef NDEBUG
 #define SCTK_ALLOC_DEBUG
-#endif //NDEBUG
+#endif
 
 /************************** MACROS *************************/
 #if defined(SCTK_ALLOC_DEBUG)