[pypy-dev] windows build crashing - command line too long

The number of c files in a pypy translation increased by 5, which pushed the length of the link command line over the windows limit. The solution is to use a response file instead of the command line. I will fix this over the next while unless someone else does it first, but until then expect complaints that windows translation is broken. Here is the error message: NMAKE : fatal error U1095: expanded command line ... too long