Cross-platform C++ launcher for emscripten

[Sam Clegg]

As a followup to the Windows-only pylauchner, I'm hoping to ship a native C++ Emscirpten launcher on all platforms soon.

The new launcher will allow most compile steps to avoid launching Python at all, only needing Python for the final link.

See the design here: https://github.com/emscripten-core/emscripten/blob/main/docs/design/03-native-clang-frontend.md
And the PR here: https://github.com/emscripten-core/emscripten/pull/27401

For emsdk users this should not be a noticeable change (other than the compiler running faster!) but for those who use Emscripten directly from git, this means they will now have a build step before it is usable.  My plan is to have the existing `./bootstrap` script take care of this so it should be straight forard.

cheers,

sam

[John Dallman]

Faster compiles will be most welcome. emcc and emc++ are notably slow at present, compared to compiling on my other platforms. 

John   

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