cache: disable useless "Cache is not responding" warning

Tuning it in a way to be actually useful is too much effort.

As alternative, there's the "buffering" detection, which operates on a
much higher level. The only disadvantage is that it's harder to guess
for the user whether this is a network problem, or if e.g. libavformat
is probing too much data when opening a stream. Maybe the cache-speed
property is helpful here.

For now, do not remove the associated code, but just silence the
warning.

Fixes #3019.

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