fix -L path in codegen/compile test
fix -L path in codegen/compile test

kali/capnpc-rust,tempbottle/capnproto-rust,maurer/capnpc-rust,kali/capnpc-rust,placrosse/capnproto-rust,maurer/capnpc-rust,dwrensha/capnpc-rust,tempbottle/capnpc-rust,dwrensha/capnproto-rust,tempbottle/capnpc-rust