COMP: Added compilation defines to use vnl_math legacy macro's with ITK5
COMP: Added compilation defines to use vnl_math legacy macro's with ITK5

Added command-line compilation defines to use `vnl_math` macro's for `abs`, `max`, `min`, `rnd`, etc., when ITK >= 5.

These macro's are also defined in "vxl\vcl\vcl_legacy_aliases.h"

SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix