[PATCH] ci: remove outdated default reference tag for ABI

[Aaron Conole]

Thomas Monjalon <thomas at monjalon.net> writes:

> The variable REF_GIT_TAG is set in the CI configuration
> like .travis.yml or .github/workflows/build.yml.
> The default value is outdated and probably unused.
> It is removed completely to avoid forgetting an update in future.
>
> Signed-off-by: Thomas Monjalon <thomas at monjalon.net>
> ---

I think the default was there for labs that run the build script
manually.  Maybe there are no such users, though.  I believe the lab has
its own script for doing such ABI checks (but can't remember off the top
of my head).

CC'd Lincoln and Owen just to confirm.

Assuming the UNH/other lab doesn't use this feature of the linux build
script,

Acked-by: Aaron Conole <aconole at redhat.com>