strace aims to be backwards compatible with older kernels so we don't
actually need to have every strace version. The 4.15-4.26 versions were
technically in a ct-ng release so they were obsoleted. Now that the
1.25.0 release is out we can remove these versions.
Going forward we will obsolete the version that is in the latest ct-ng
release and simply remove intervening strace versions as they are
released.
Signed-off-by: Chris Packham <judge.packham@gmail.com>
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