fix(coq): pass correct flags to coqdep when building boot libs

[Alizter]

fix #7909

I've tested the reproduction in #7909 and it works. I will not add a test for this.

• changelog

[ejgallego]

Thanks a lot @Alizter , will review (and hopefully merge) ASAP.

[ejgallego]

I will not add a test for this.

Why not?

Patch seems broken? Didn't look closely at the test cases but maybe this is due to the logic being a bit more subtle now.

Even in earlier versions of the build language, we do detect the boot library that is in $coqlib, thus the condition needs to be refined for langs < 0.8 as to be "we have a boot library, and its path is in the workspace"

Does it make sense?

[Alizter]

@ejgallego feel free to takeover. It seemed to work for me.

[ejgallego]

@ejgallego feel free to takeover. It seemed to work for me.

I see CI / Coq test suite is broken, isn't it?

[Alizter]

@ejgallego only updating thr new flags.

[Alizter]

If this is the right fix, please resurrect.

[ejgallego]

@ejgallego only updating the new flags.

I see a truly broken test-case and a few suspicious things, don't you?

It seems that combining -boot (>= 0.8) and theories that doesn't ( < 0.8) could turn out the be quite tricky, see for example the discussion at https://coq.zulipchat.com/#narrow/stream/240550-Dune-devs-.26-users/topic/Adding.20transitive.20deps.20into.20theories