[scribus-dev] new feedback from cmake

[Gregory Pittman]

It seems that with cmake 3.9.0 we now get a new message when running it:

CMake Deprecation Warning at scribus/CMakeLists.txt:1175 (cmake_policy):
   The OLD behavior for policy CMP0003 will be removed from a future version
   of CMake.

   The cmake-policies(7) manual explains that the OLD behaviors of all
   policies are deprecated and that a policy should be set to OLD only under
   specific short-term circumstances.  Projects should be ported to the NEW
   behavior and not rely on setting a policy to OLD.

Greg