BUG: Propagate compiler choice, compiler flags, OSX architecture to superbuild
BUG: Propagate compiler choice, compiler flags, OSX architecture to superbuild

Change-Id: If639c7a7ecfff12e1f1da37092f15cb956b656fe

sumedhasingla/TubeTK,KitwareMedical/ITKTubeTK,cdeepakroy/TubeTK,cdeepakroy/TubeTK,KitwareMedical/TubeTK,thewtex/TubeTK,KitwareMedical/ITKTubeTK,aylward/ITKTubeTK,KitwareMedical/TubeTK,sumedhasingla/TubeTK,KitwareMedical/TubeTK,matthieuheitz/TubeTK,LucasGandel/TubeTK,LucasGandel/TubeTK,thewtex/TubeTK,aylward/ITKTubeTK,sumedhasingla/TubeTK,matthieuheitz/TubeTK,thewtex/TubeTK,matthieuheitz/TubeTK,cdeepakroy/TubeTK,aylward/ITKTubeTK,LucasGandel/TubeTK,KitwareMedical/ITKTubeTK,LucasGandel/TubeTK,matthieuheitz/TubeTK,sumedhasingla/TubeTK,KitwareMedical/TubeTK,KitwareMedical/ITKTubeTK,aylward/ITKTubeTK,thewtex/TubeTK,cdeepakroy/TubeTK