Download PyCrypto from pypi.python.org for our Gitian builds
Using https://ftp.dlitz.net/pub/dlitz/crypto/pycrypto/pycrypto-2.6.1.tar.gz for downloading PyCrypto is annoying like hell on our LXC machine. We could use https://pypi.python.org/packages/source/p/pycrypto/pycrypto-2.6.1.tar.gz which even has a signature for it: https://pypi.python.org/packages/source/p/pycrypto/pycrypto-2.6.1.tar.gz.asc
Thanks to isis for spotting this.