WIP: python2.7: make it cross-compile

checking for getaddrinfo... yes
checking getaddrinfo bug... yes
Fatal: You must get working getaddrinfo() function.
       or you can specify "--disable-ipv6".
builder for `/nix/store/x6m9xnac3s1nxdn2p1lsjfgp63msxv12-python-2.7.5-arm-unknown-linux-gnueabi.drv' failed with exit code 1