* feat: enable whole-program optimization

Enable whole-program optimization in electron native modules by default.

Co-authored-by: Kyrylo Hrechykhin <khrechykhin@microsoft.com>

* pass --with-ltcg to configure.py instead of setting variable

Co-authored-by: Kyrylo Hrechykhin <khrechykhin@microsoft.com>

* enable ltcg only on windows

Co-authored-by: Kyrylo Hrechykhin <khrechykhin@microsoft.com>

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Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Kyrylo Hrechykhin <khrechykhin@microsoft.com>
Co-authored-by: John Kleinschmidt <jkleinsc@electronjs.org>