main/go: add cross subpackage

The cross subpackages ships cross compilers for Darwin, FreeBSD, OpenBSD
and Microsoft Windows. Those are not all platforms theoretically
supported by go but I guess those are the most relevant once.

In the future it might be a good idea to add cross compilers for other
platforms and architectures as well but before doing so you probably
want to create one subpackage for each platform otherwise the cross
subpackage gets too big.

My computer is too slow to compile go for all these platforms and
architectures in a timely manner so I only compiled the go cross
compiler for OpenBSD amd64 and OpenBSD i386. In addition to that the
OpenBSD amd64 cross compiler was successfully used to cross compile a
small program.

If you have access to a faster computer then please test this on other
architectures (Darwin, FreeBSD and Microsoft Windows).

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