Makefile: Don't read COMMIT, BUILDTAGS, EXTRA_BUILDTAGS from env vars #4380
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We recently switched VERSION to be read from env vars (#4270). This
broke several projects, as they were building runc and using a
VERSION
env var for, e.g. the containerd version.
When fixing that in #4370, we discussed to consider doing the same for
these variables too
(#4370 (review)).
Let's stop reading them from env vars, as it is very easy to do it by
mistake (e.g. compile runc and define a COMMIT env var, not to override
the commit shown in
runc --version
) and users that want can stilloverride them if they want to. For example, with: