[pypy-dev] I reinstated the nightly run of cpython tests against pypy-c

I switched to only test these combinations: 1) hybrid gc thread old-style allworkingmodules the result of a try run for this one can be seen at the usual place: http://www2.openend.se/~pedronis/pypy-c-test/allworkingmodules/summary.html http://www2.openend.se/~pedronis/pypy-c-test/allworkingmodules/56156/index.h... although just the % doesn't tell much it seems we had some regressions in some fundamental tests, like test_builtin also our modified test_descr segfaults with this combination/these days it seems 2) stackless old-style allworkingmodules