main/gcc: add support for gcc-go
This adds support for gcc-go using libucontext-dev. Additionally, several patches are required to make this work with musl libc. These have been taken form Adélie Linux. However, Adélie Linux still uses gcc 8.X, I had to additional minor patches to make gcc-go 10.X compile. The changes proposed here have been reviewed and ok'ed by Ariadne.
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