dejagnu: Disable ccache

[Ben Elliston]

On Sun, Sep 04, 2016 at 10:44:27AM +0200, Jan Kratochvil wrote:

> So I find most safe and easy to just disable ccache for all
  testsuites.

Thanks--I agree.  As a principle, it makes no sense to cache in a test
environment.

Cheers, Ben
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