fuzz: better configure checks for MSAN building

[catenacyber]

Link to redmine ticket:
None

Describe changes:

• Improves configure check for Rust nightly version, in order to build with MSAN if needed

It seems #5411 was not good enough for oss-fuzz Docker

Replaces #5421 with version working bot locally and on oss-fuzz with catenacyber/oss-fuzz@4c922f1

Let's check if CI is happy with other systems

[jasonish]

Would it be useful to duplicate the ubuntu-18-04-fuzz CI test, use Rust nightly then do a post-configure check that this was setup correctly?

[catenacyber]

Would it be useful to duplicate the ubuntu-18-04-fuzz CI test, use Rust nightly then do a post-configure check that this was setup correctly?

For at least one with fuzzing, I think it would be useful to have Rust nightly, as it is needed to get the best out of fuzzing Rust.
Between the Debian one, or the Ubuntu one, I do not know if it makes a difference

[jasonish]

Would it be useful to duplicate the ubuntu-18-04-fuzz CI test, use Rust nightly then do a post-configure check that this was setup correctly?

For at least one with fuzzing, I think it would be useful to have Rust nightly, as it is needed to get the best out of fuzzing Rust.
Between the Debian one, or the Ubuntu one, I do not know if it makes a difference

I'd probably go with a new Ubuntu 20.04 test.

[catenacyber]

Ok, so... do you want this new ubuntu test qs part of this PR ?

[jasonish]

Ok, so... do you want this new ubuntu test qs part of this PR ?

Doesn't really matter. But should probably be based on this PR.

[catenacyber]

@jasonish do you manage to install/run dustup in Github CI builds ?
Or do you know an equivalent of rustup component add rust-src without using rustup ?

[jasonish]

@jasonish do you manage to install/run dustup in Github CI builds ?
Or do you know an equivalent of rustup component add rust-src without using rustup ?

Rustup is used in GitHub CI builds, see: https://github.com/OISF/suricata/blob/master/.github/workflows/builds.yml#L916 for an example.

[catenacyber]

Rustup is used in GitHub CI builds

I see its download, but then I cannot use it as it is not in the PATH cf
https://github.com/catenacyber/suricata/runs/1165320022?check_suite_focus=true

[victorjulien]

Merged in #5452, thanks!