ENH: Supress FLTK warnings
ENH: Supress FLTK warnings

Change-Id: I63d059766ae875814d4b6f333b68629c46aff01e

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