Quiet policy warning

[white238]

The following is being generated due to using an old and soon to be deprecated policy:

-- CMake Executable: /usr/tce/backend/installations/linux-rhel8-x86_64/gcc-8.3.1/cmake-3.23.1-4mghsxgbyra5n74znxdfn5rt3jms6boy/bin/cmake

CMake Deprecation Warning at blt/SetupBLT.cmake:73 (cmake_policy):
  The OLD behavior for policy CMP0076 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.

Call Stack (most recent call first):
  CMakeLists.txt:106 (include)