Improve release script's windows build.
Improve release script's windows build.

geofft/capnproto,zarvox/capnproto,mologie/capnproto,joliss/capnproto,bsn069/capnproto,bryce-gibson/capnproto,maurer/capnproto,ligzy/capnproto,kamalmarhubi/capnproto,vladon/capnproto,hntrmrrs/capnproto,bryce-gibson/capnproto,pjulien/capnproto,Fraser999/capnproto,martindale/capnproto,khklau/capnproto,khklau/capnproto,jparyani/capnproto,joliss/capnproto,maurer/capnproto,a-richardson/capnproto,modulexcite/capnproto,mrdomino/capnproto,maurer/capnproto,bsn069/capnproto,johnkdoe/capnproto,ocdtrekkie/capnproto,ligzy/capnproto,johnkdoe/capnproto,modulexcite/capnproto,jparyani/capnproto,geofft/capnproto,zarvox/capnproto,geofft/capnproto,mologie/capnproto,rcrowder/capnproto,pjulien/capnproto,mologie/capnproto,hntrmrrs/capnproto,ligzy/capnproto,nagyistoce/capnproto,a-richardson/capnproto,hntrmrrs/capnproto,jparyani/capnproto,rcrowder/capnproto,modulexcite/capnproto,vladon/capnproto,MarPiRK/capnproto,zarvox/capnproto,kamalmarhubi/capnproto,nagyistoce/capnproto,ocdtrekkie/capnproto,nagyistoce/capnproto,pjulien/capnproto,MarPiRK/capnproto,Fraser999/capnproto,MarPiRK/capnproto,ocdtrekkie/capnproto,bsn069/capnproto,rcrowder/capnproto,joliss/capnproto,khklau/capnproto,mrdomino/capnproto,martindale/capnproto,johnkdoe/capnproto,Fraser999/capnproto,martindale/capnproto,bryce-gibson/capnproto,a-richardson/capnproto,kamalmarhubi/capnproto,mrdomino/capnproto,vladon/capnproto