CMake: Add CPU based BDB root path detection for macOS
CMake: Add CPU based BDB root path detection for macOS

The `BerkeleyDB_ROOT_DIR` CMake variable only expects a single path instead of a list when no cache exists, so use the build host CPU arch to determine the correct path to pass to the build system.

Apple Silicon homebrew path is (by default) `/opt/homebrew`, whereas Intel hombrew path is `/usr/local`

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