COMP: Modern gcc compilers have a reasonable template depth limit
COMP: Modern gcc compilers have a reasonable template depth limit

This will steamline infegration of OpenIGTLink by not contraining downstream
project to a specific template depth.

Adapted from InsightSoftwareConsortium/ITK@5bcca74

openigtlink/OpenIGTLink,tokjun/OpenIGTLink,openigtlink/OpenIGTLink,leochan2009/OpenIGTLink,openigtlink/OpenIGTLink,openigtlink/OpenIGTLink,leochan2009/OpenIGTLink,leochan2009/OpenIGTLink,tokjun/OpenIGTLink,leochan2009/OpenIGTLink,tokjun/OpenIGTLink,tokjun/OpenIGTLink,openigtlink/OpenIGTLink,tokjun/OpenIGTLink,leochan2009/OpenIGTLink