Document wasm relinking functionality

[CoffeeFlux]

Once #43689 is resolved we should be able to relink a project for even greater size reductions savings, most notably linking out ICU. We should document this and probably stand up a test.

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Issue Details

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Once #43689 is resolved we should be able to relink a project for even greater size reductions savings, most notably linking out ICU. We should document this and probably stand up a sample.

Author:	CoffeeFlux
Assignees:	-
Labels:	arch-wasm, area-Build-mono, documentation
Milestone:	6.0.0

Tagging subscribers to 'size-reduction': @eerhardt, @SamMonoRT, @marek-safar, @tannergooding, @CoffeeFlux
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Issue Details

---

Once #43689 is resolved we should be able to relink a project for even greater size reductions savings, most notably linking out ICU. We should document this and probably stand up a sample.

Author:	CoffeeFlux
Assignees:	-
Labels:	arch-wasm, area-Build-mono, documentation, size-reduction
Milestone:	6.0.0

[marek-safar]

I don't think this should be only documented but automatically included in the release build config

[CoffeeFlux]

Automatically including it seems nice from a size perspective but it would require fetching emscripten on customer machines, no? Either way, it would be really nice to get a successful ICU-less build on my machine for size estimation purposes sooner rather than later, whether that's accomplished through running it automatically or just documenting it.

[CoffeeFlux]

Need to issue warning when emscripten is not present and use a system install by default.