[Cython] Speedup hudson job with ccache

[Stefan Behnel]

Vitja Makarov, 07.07.2011 08:32:
> 2011/7/7 Stefan Behnel
>
>> Robert Bradshaw, 06.07.2011 21:32:
>>
>>   We should get ccache on sage.math to start using it on hudson.
>>>
>>
>> It's just a single binary when installed. I have a copy in my ~/ccache/bin.
>> Changing the Jenkins jobs now.
>>
>>
> Is that already used?

Actually, no. I noticed that it would a) require changes to all test jobs, 
and b) prevent us from getting clean test runs. I prefer a safe and clean 
run over a fast one.

Also, the test runner clears the target directory on startup. I wonder 
where you got your numbers from...

Stefan