message: travis: Compile once on xenial
diff: @@ -99,6 +99,15 @@ jobs:
  DEP_OPTS="NO_QT=1 NO_UPNP=1 DEBUG=1 ALLOW_HOST_PACKAGES=1"
  GOAL="install"
  BITCOIN_CONFIG="--enable-zmq --with-gui=qt5 --enable-glibc-back-compat --enable-reduce-exports --enable-debug CXXFLAGS=\"-g0 -O2\""
  +# x86_64 Linux (xenial, no depends, only system libs)
  + - stage: test
  + env: >-
  + HOST=x86_64-unknown-linux-gnu
  + DOCKER_NAME_TAG=ubuntu:16.04
  + PACKAGES="python3-zmq qtbase5-dev qttools5-dev-tools libssl-dev libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev libdb5.3++-dev libminiupnpc-dev libzmq3-dev libprotobuf-dev protobuf-compiler libqrencode-dev"
  + NO_DEPENDS=1
  + GOAL="install"
  + BITCOIN_CONFIG="--enable-zmq --with-incompatible-bdb --enable-glibc-back-compat --enable-reduce-exports --with-gui=qt5 CPPFLAGS=-DDEBUG_LOCKORDER"
  # x86_64 Linux (no depends, only system libs)
  - stage: test
  env: >-
  