Check that the current version of CMake supports policy 141 before se… (

NVIDIA#1924)

* Check that the current version of CMake supports policy 141 before setting it.

Fixes NVIDIA#1919

* Use if(POLICY ...) to test if the CMake policy is known.

CMakeLists.txt

@@ -2,8 +2,8 @@
 # 3.21 is the minimum for the developer build.
 cmake_minimum_required(VERSION 3.15)
 
-# sccache cannot handle the -Fd option generationg pdb files
-if ("MSVC" STREQUAL "${CMAKE_CXX_COMPILER_ID}")
+# sccache cannot handle the -Fd option generating pdb files:
+if (POLICY CMP0141)
   cmake_policy(SET CMP0141 NEW)
 endif()