Include wasi-sdk as a dependency for the clang project

See: https://bugzilla.mozilla.org/show_bug.cgi?id=1601448

mentioned in issue #40020 (closed)

mentioned in issue #40014

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This was indeed a problem with !603 (merged).

This was the reason for which Mozilla's hack to use the already built Clang didn't work at the first attempt: Clang needs libclang_rt.builtins-wasm32.a to compile the WASI SDK successfully.

At the moment, the workaround is to copy that library only in firefox and geckoview.

I am not sure we want to do the opposite, i.e., find a way to compile WASI in the clang project, to always have it.

I do not like big projects very much, and eventually did the opposite also for compiler-rt (even though the reason for this one is that my goal is to have a single archive of a series of projects, such as Clang, CMake, maybe binutils, etc...).

marked this issue as related to #40353 (closed)

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marked this issue as related to #40014