[compiler-rt][CMake] Do not explicitly set CMP0114 to old (#90386)

This was added in def0823 to fix a bot
failure, specifically for the standalone build. This does not seem to be
an issue anymore, and setting the policy explicitly to OLD causes
warnings with newer CMake versions.

This patch removes setting the policy to OLD to get rid of the warning.

Author: boomanaiden154

compiler-rt/cmake/Modules/AddCompilerRT.cmake

@@ -2,12 +2,6 @@ include(ExternalProject)
 include(CompilerRTUtils)
 include(HandleCompilerRT)
 
-# CMP0114: ExternalProject step targets fully adopt their steps.
-# New in CMake 3.19: https://cmake.org/cmake/help/latest/policy/CMP0114.html
-if(POLICY CMP0114)
-  cmake_policy(SET CMP0114 OLD)
-endif()
-
 function(set_target_output_directories target output_dir)
   # For RUNTIME_OUTPUT_DIRECTORY variable, Multi-configuration generators
   # append a per-configuration subdirectory to the specified directory.