Disable HTTP Range usage if varnish < 6.4 is involved

Debian buster (oldstable) ships 6.1 while bullseye (stable) ships 6.5
and so the later is 'fixed'. Upstream declares 6.0 still as supported.
It might be still a while we encounter "bad" versions in the wild, so
if we can detect and work around the issue at runtime automatically we
can save some users from running into "persistent" partial files.

References: https://varnish-cache.org/docs/6.4/whats-new/changes-6.4.html#changes-in-behavior

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