Warnings with cmake 3.17.3

[tomlogic]

Working on building libpinproc with current MSYS2/MinGW64 configuration, and the latest cmake version is generating these errors:

CMake Deprecation Warning at CMakeLists.txt:9 (cmake_policy):
  The OLD behavior for policy CMP0012 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.


CMake Deprecation Warning at CMakeLists.txt:13 (cmake_policy):
  The OLD behavior for policy CMP0015 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.

[tomlogic]

I have an update in my fork that takes care of these warnings.