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

Building the Apple way turns off plugin support, meaning we don't need
to export unloadable symbols from all executables. While deadstripping
effects aren't expected to change, enabling this across all tools
prevents the creation of export tries. This saves us ~3.5 MB in just the
universal build of `clang`.

GitOrigin-RevId: 25cf27910c3a58e71e37c3d5391235730aa7c488
1 file changed