build: preserves symbols during LTO with macOS linker

man ld -export_dynamic:

```
Preserves all global symbols in main executables during LTO.

Without this option, Link Time Optimization is allowed to inline
and remove global functions.

This option is used when a main executable may load a plug-in which
requires certain symbols from the main executable.
```

Bug: vercel/pkg#1155
Signed-off-by: Jesse Chan <jc@linux.com>

PR-URL: https://github.com/nodejs/node/pull/39839


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>