Allow non-const kj::Lazy.
Allow non-const kj::Lazy.

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