Use ip4 sockets for wildcard on OpenBSD
Use ip4 sockets for wildcard on OpenBSD

Short-term fix for #220.

jparyani/capnproto,joliss/capnproto,rcrowder/capnproto,nagyistoce/capnproto,hntrmrrs/capnproto,ocdtrekkie/capnproto,pjulien/capnproto,MarPiRK/capnproto,mologie/capnproto,martindale/capnproto,vladon/capnproto,hntrmrrs/capnproto,hntrmrrs/capnproto,maurer/capnproto,vladon/capnproto,mrdomino/capnproto,nagyistoce/capnproto,MarPiRK/capnproto,pjulien/capnproto,joliss/capnproto,mrdomino/capnproto,ocdtrekkie/capnproto,ocdtrekkie/capnproto,martindale/capnproto,maurer/capnproto,rcrowder/capnproto,mologie/capnproto,MarPiRK/capnproto,mrdomino/capnproto,martindale/capnproto,kamalmarhubi/capnproto,kamalmarhubi/capnproto,mologie/capnproto,joliss/capnproto,maurer/capnproto,jparyani/capnproto,kamalmarhubi/capnproto,nagyistoce/capnproto,pjulien/capnproto,jparyani/capnproto,rcrowder/capnproto,vladon/capnproto