[Cython] Speedup hudson job with ccache

[Vitja Makarov]

I tried to speedup runtests with ccache

How to run:
CYTHON_RUNTESTS_CCACHE="ccache" python  runtests.py

Running 'CYTHON_RUNTESTS_CCACHE="ccache" python  runtests.py --no-cpp'
first time takes 490 seconds on my PC,
second time is 214, speed up is 2.2x, cache size is 16MB

https://github.com/vitek/cython/commit/c2fb58c780d8727f95353d3f0c28028977a8661c

-- 
vitja.