ell: Add new wrap for ell

[hadess]

Upstream repository is at:
https://git.kernel.org/pub/scm/libs/ell/ell.git/

[hadess]

I apparently need to find replacements for 2 shell scripts that are used to work-around meson limitations:

• gen-cert-expired-pem.sh (used in unit/meson.build)
• xxd.sh (used in unit/meson.build)

[eli-schwartz]

Edit: ah, the remaining failures aren't actually because of this, sorry. My bad. :P

I apparently need to find replacements for 2 shell scripts that are used to work-around meson limitations:

* [gen-cert-expired-pem.sh](https://github.com/hadess/ell/blob/wip/hadess/ell-0.82-add-meson/unit/gen-cert-expired-pem.sh) (used in [unit/meson.build](https://github.com/hadess/ell/blob/wip/hadess/ell-0.82-add-meson/unit/meson.build#L345-L350))

* [xxd.sh](https://github.com/hadess/ell/blob/wip/hadess/ell-0.82-add-meson/unit/xxd.sh) (used in [unit/meson.build](https://github.com/hadess/ell/blob/wip/hadess/ell-0.82-add-meson/unit/meson.build#L414-L422))

Per my advice on IRC, the latest version of this PR uses capture/feed in meson to avoid creating the xxd wrapper script.

The remaining script can be whitelisted here:

wrapdb/tools/sanity_checks.py

Line 39 in 6584cbe

PER_PROJECT_PERMITTED_FILES: dict[str, set[str]] = {

It is reasonable to whitelist -- it is being used by the build system, it's not trying to replace upstream sources or anything.

[hadess]

Edit: ah, the remaining failures aren't actually because of this, sorry. My bad. :P

Yes, we've managed to proceed further, we're now at the point where some of the tests will only pass if a specific kernel module is loaded:
https://patchwork.kernel.org/project/ell/patch/20260211164200.3968281-1-hadess@hadess.net/

I guess I will have to wait for this patch to be merged upstream, and in a release before I can proceed with this wrap.