[clang] [lldb] [llvm] [cmake] Build executables with -no_exported_symbols when building Apple toolchain (PR #87684)

[Dan Liew via cfe-commits]

https://github.com/delcypher approved this pull request.

LGTM. Other than the nit about not using `FORCE` to set the CMake cache variable.

https://github.com/llvm/llvm-project/pull/87684