[build2] How to append options to dumpmachine ?

[Michael Martin Moro]

Hi !

I'm trying to get the cheerp compiler to work with build2. Cheerp 
supports two targets, one for WASM, another for JavaScript. The default 
one is WASM, but the one I want to use is JavaScript.

The issue is that when Build2 probes the compiler, it calls:

/opt/cheerp/bin/clang++ -dumpmachine

Which returns the default target, cheerp-leaningtech-webbrowser-wasm.

I want it to return cheerp-leaningtech-webbrowser-genericjs, which would 
be the result of:

/opt/cheerp/bin/clang++ -dumpmachine -target cheerp-genericjs

Is there a way to specify the options passed when running -dumpmachine ?

Thanks !
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