[native_toolchain_c] Add linking on Linux

[mosuem]

Extend API by providing a CLinker, supporting development only on linux for now. Other platforms to be added in future PRs.

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[mosuem]

@dcharkes if you want to take a first look.

[coveralls]

coverage: 91.823% (-0.2%) from 92.067%
when pulling cbc364b on exposeLinkFromCtoolchain
into 695c065 on main.

[dcharkes]

Add linking for native_toolchain_c and linux

[native_toolchain_c] Linker support for Linux

[dcharkes]

We also need to do cross arch, not only cross OS. Please add support/tests or an unsupported error.

I think after that it's good to merge! 🚀