COMP: Fix tubeBaseIOPrintTest with option TubeTK_USE_LIBSVM disabled
COMP: Fix tubeBaseIOPrintTest with option TubeTK_USE_LIBSVM disabled

This commit addresses the issue thrown when building TubeTK with
the option TubeTK_USE_LIBSVM set to off. See [1].
Since the include of itktubePDFSegmenterSVMIO.h depends on the value
of TubeTK_USE_LIBSVM, the print test should also meet the same
condition before being compiled.

[1]:/path/to/TubeTK-src/Base/IO/Testing/tubeBaseIOPrintTest.cxx:67:3:
    error: ‘PDFSegmenterSVMIO’ is not a member of ‘itk::tube’

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