Use binary distro of Golang

This is a bummer, but Gradle already specifies tons of specific versions
of various binary components, so this is not materially different than
the rest of how this whole thing works.

It also allows us to specify the Go version that will actually build a
working binary of wireguard-go, since all of the Go bugs mean not every
version works equally. We do *not* want to use whatever version a distro
happens to be shipping.

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