[CMake] Do not set CMP0114 explicitly to old (#90384)

CMP0114 was originally set to old to get rid of warnings. However, this
behavior is now set to new by default with the minimum CMake version
that LLVM requires so does not produce any warnings, and setting it
explicitly to old does produce a warning in newer CMake versions. Due to
these reasons, remove this check for now.

Splitting off from removing the CMP0116 check just in case something
breaks.

Partially fixes #83727.

Author: boomanaiden154

cmake/Modules/CMakePolicy.cmake

@@ -1,10 +1,5 @@
 # CMake policy settings shared between LLVM projects
 
-# 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()
 # CMP0116: Ninja generators transform `DEPFILE`s from `add_custom_command()`
 # New in CMake 3.20. https://cmake.org/cmake/help/latest/policy/CMP0116.html
 if(POLICY CMP0116)