ENH: Allow Boost enablement for dashboard builds in InitCMakeCache.cmake.in.
ENH: Allow Boost enablement for dashboard builds in InitCMakeCache.cmake.in.

Change-Id: Iffd90ad507023e3205c1b7f4f2a2425a5e6370de

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