.travis.yml: Update to use arm64/ppc64le/s390x.

* Use only the free pipelines arm64/ppc64le/s390x without credits on Travis.
  See <https://docs.travis-ci.com/user/billing-overview/#partner-queue-solution>.
* Add ppc64le case.
* Update the gcc to gcc-11.
* Remove unused logic.
* Add the `tool/travis_wait.sh` to avoid a command timeout.
* Run the tests skipping some failing tests.
  * Set `TEST_ALL_SKIPPED_TESTS` env to skip the tests.
  * Run the tests separately returning ok status.
    The tests are executed if `TEST_ALL_SKIPPED_TESTS` env is set or
    `TEST_ALL_SEPARATED_TESTS` env is set.
  * Add `tool/ci_functions.sh` to manage the functions used in CI.
* Add arm64 to allow_failures due to the following issue.
  An arm64 job sometimes does not start right now.
  https://travis-ci.community/t/11629

1 files changed, 18 insertions, 0 deletions

diff --git a/tool/travis_wait.sh b/tool/travis_wait.sh
new file mode 100755
index 0000000000..471b765df8
--- /dev/null
+++ b/tool/travis_wait.sh
@@ -0,0 +1,18 @@
+#!/bin/bash -eu
+# The modified version of `travis_wait` to output a log as the command goes.
+# https://github.com/travis-ci/travis-ci/issues/4190#issuecomment-353342526
+
+# Produce an output log every 9 minutes as the timeout without output is 10
+# minutes. A job finishes with a timeout if it takes longer than 50 minutes.
+# https://docs.travis-ci.com/user/customizing-the-build#build-timeouts
+while sleep 9m; do
+  # Print message with bash variable SECONDS.
+  echo "====[ $SECONDS seconds still running ]===="
+done &
+
+echo "+ $@"
+"$@"
+
+jobs
+kill %1
+exit 0