[PATCH 20/25] Compile debug functions only in debug mode

Remove unused local functions

In NCollection_IncAllocator.cxx, unused functions
Debug_Create and Debug_Destroy defined in
NCollection_IncAllocator.cxx. These functions may be
useful for debugging. As a consequence, they are not
compiled anymore in Release mode, only in Debug mode.

Contributed by: QbProg, Thomas Paviot