set the C compiler in travis config
set the C compiler in travis config

dwrensha/capnproto-java,nchinmay/capnproto-java,jen20/capnproto-java,nchinmay/capnproto-java,dwrensha/capnproto-java,nchinmay/capnproto-java,dwrensha/capnproto-java,jen20/capnproto-java,jen20/capnproto-java