[lldb] Configure CMake policy CMP0116 for standalone builds #3633
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Using CMake >=3.20 results in many warnings about this new policy. This change silences the warnings by explicitly declaring use of the "OLD" behavior.
This applies D101083 to LLDBStandalone.cmake.
Differential Revision: https://reviews.llvm.org/D112497
(cherry picked from commit 65dae8b)