Fix `CAPNP_LITE` build.
Fix `CAPNP_LITE` build.

The changes to 'capnp/generated-header-support.h' in [b469079] need to
be applied to both sides of the `#if CAPNP_LITE` conditional.

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