CMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY deprecated but not CMAKE_FIND_PACKAGE_NO_SYSTEM_PACKAGE_REGISTRY
For CMake 3.16, we've currently left behind one inconsistency regarding the package registries. We've added CMAKE_FIND_USE_PACKAGE_REGISTRY
as a replacement for CMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY
and deprecated the latter, but we haven't done anything about CMAKE_FIND_PACKAGE_NO_SYSTEM_PACKAGE_REGISTRY
. It seems odd to deprecate one but not the other.