Merge bitcoin#17661: ci: use depends for s390x

e190000 ci-s390x: Add qemu and depends support in the ci script (Elichai Turkel)

Pull request description:

  Related: bitcoin#17599

  This adds qemu support just like we have in arm and compile the depends.

  other than that I also fixed some missing includes to make the depends compile.

ACKs for top commit:
  MarcoFalke:
    ACK e190000 (first commit only, didn't look at second commit)

Tree-SHA512: 2b8a39772b86408569f52cdc33832dbce7e5e9cdd710524295f3d259628cdfc017e740f6f94941307d7f8e413236814a95ba851153c617eb5fb75b4bd9a7e52f

.travis.yml

@@ -237,6 +237,7 @@ after_success:
  arch: s390x
  env: >-
  FILE_ENV="./ci/test/00_setup_env_s390x.sh"
+ QEMU_USER_CMD="" # Can run the tests natively without qemu
 
  - stage: test
  name: 'Win64 [GOAL: deploy] [unit tests, no gui, no functional tests]'

ci/test/00_setup_env_s390x.sh

@@ -6,9 +6,11 @@
 
 export LC_ALL=C.UTF-8
 
-export HOST=s390x-unknown-linux-gnu
-export PACKAGES="clang llvm python3-zmq qtbase5-dev qttools5-dev-tools 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 libqrencode-dev"
-export NO_DEPENDS=1
+export HOST=s390x-linux-gnu
+# The host arch is unknown, so we run the tests through qemu.
+# If the host is s390x and wants to run the tests natively, it can set QEMU_USER_CMD to the empty string.
+export QEMU_USER_CMD="${QEMU_USER_CMD:"qemu-s390x"}"
+export PACKAGES="python3-zmq bsdmainutils qemu-user"
 export RUN_UNIT_TESTS=true
 export RUN_FUNCTIONAL_TESTS=true
 export GOAL="install"