hadrian: Ensure that settings is regenerated during bindist installationwip/T20253

Previously Hadrian would simply install the settings file generated in
the build environment during the binary distribution installation. This
is wrong since these environments may differ (e.g. different `cc`
versions).

We noticed on Darwin when installation of a binary distribution produced
on a newer Darwin release resulted in a broken compiler due to the
installed `settings` file incorrectly claiming that `cc` supported
`-no-pie`.

Fixing this sadly requires a bit of code duplication since `settings` is
produced by Hadrian and not `configure`. For now I have simply
duplicated the `settings` generation logic used by the Make build system
into Hadrian's bindist Makefile.

Ultimately the solution will probably involve shipping a freestanding
utility to replace `configure`'s toolchain probing logic and generate a
toolchain description file (similar to `settings`) as described
in #19877.

Fixes #20253.

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