Remove a warning in cmake dashboard:

CMake Warning (dev) in Utilities/socketxx/socket++/CMakeLists.txt:
  Policy CMP0022 is not set: INTERFACE_LINK_LIBRARIES defines the link
  interface.  Run "cmake --help-policy CMP0022" for policy details.  Use the
  cmake_policy command to set the policy and suppress this warning.

  Target "socketxx" has an INTERFACE_LINK_LIBRARIES property which differs
  from its LINK_INTERFACE_LIBRARIES properties.

  INTERFACE_LINK_LIBRARIES:

    ws2_32.lib

  LINK_INTERFACE_LIBRARIES:

This warning is for project developers.  Use -Wno-dev to suppress it.