Remove optimization compiler flag from CMAKE_CXX_FLAGS.
Remove optimization compiler flag from CMAKE_CXX_FLAGS.

sk1712/IRTK,BioMedIA/IRTK,BioMedIA/irtk-legacy,BioMedIA/irtk-legacy,BioMedIA/irtk-legacy,BioMedIA/IRTK,ghisvail/irtk-legacy,ghisvail/irtk-legacy,sk1712/IRTK,ghisvail/irtk-legacy,sk1712/IRTK,BioMedIA/IRTK,ghisvail/irtk-legacy,BioMedIA/irtk-legacy,sk1712/IRTK,BioMedIA/IRTK