RFR: 8293098: GHA: Harmonize GCC version handling for host and cross builds [v2]

[Aleksey Shipilev]

On Tue, 30 Aug 2022 15:20:30 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> Seems like a good cleanup. I never fully got to the end of making this part nice when I rewrote the GHA script.

Yeah, I figured :)
 
> If you want to unify this even more, I think (iirc) that it possible to e.g. set a top-level `env` section defining the gcc version we use, and reference it in the `jobs:*:with` sections.

I would prefer to do it later, as there are dependent PRs riding on this one, and testing takes quite a while...

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PR: https://git.openjdk.org/jdk/pull/10083