CI for qemu-hexagon

[Alessandro Di Federico]

Hi Alex, I hope you enjoyed the holidays!

We're trying to upstream idef-parser (the automatic generator of the
Hexagon frontend). This introduces new dependencies, specifically flex
and bison.

Attached you can find our patch for that.

However the CI fails:

    https://gitlab.com/carl.cudig/qemu/-/jobs/1939950230

AFAIU the Hexagon docker image is "special" since it's the only one
that needs the cross-compiler to be built from source and, therefore,
it's a process that needs to be triggered manually.
Is this correct?

If so, what should we do? Make a pull request despite the failure and
then it will be taken care of, or should I make a separate (preliminary)
pull request just for that patch?

-- 
Alessandro Di Federico
rev.ng

import-flex-bison.patch
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