[BUILD] Enable old behavior of CMP0092 (open-telemetry#3269)

Author: ThomsonTan

CMakeLists.txt

@@ -19,6 +19,12 @@ if(POLICY CMP0091)
   cmake_policy(SET CMP0091 NEW)
 endif()
 
+if(POLICY CMP0092)
+  # https://cmake.org/cmake/help/latest/policy/CMP0092.html#policy:CMP0092 Make
+  # sure the /W3 is not removed from CMAKE_CXX_FLAGS since CMake 3.15
+  cmake_policy(SET CMP0092 OLD)
+endif()
+
 # MSVC RTTI flag /GR should not be not added to CMAKE_CXX_FLAGS by default. @see
 # https://cmake.org/cmake/help/latest/policy/CMP0117.html
 if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.20.0")