* Replace YAML anchors by extends in the gitlab-CI yaml files
* Many small qtest fixes (e.g. to fix issues discovered by Coverity)
* Poison more config switches in common code
* Fix the failing Travis-CI and Cirrus-CI tasks

# gpg: Signature made Fri 14 May 2021 12:17:39 BST
# gpg:                using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg:                issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [full]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3  EAB9 2ED9 D774 FE70 2DB5

* remotes/thuth-gitlab/tags/pull-request-2021-05-14:
  cirrus.yml: Fix the MSYS2 task
  pc-bios/s390-ccw: Fix inline assembly for older versions of Clang
  tests/qtest/migration-test: Use g_autofree to avoid leaks on error paths
  configure: Poison all current target-specific #defines
  migration: Move populate_vfio_info() into a separate file
  include/sysemu: Poison all accelerator CONFIG switches in common code
  tests: Avoid side effects inside g_assert() arguments
  tests/qtest/rtc-test: Remove pointless NULL check
  tests/qtest/tpm-util.c: Free memory with correct free function
  tests/migration-test: Fix "true" vs true
  tests/qtest/npcm7xx_pwm-test.c: Avoid g_assert_true() for non-test assertions
  tests/qtest/ahci-test.c: Calculate iso_size with 64-bit arithmetic
  util/compatfd.c: Replaced a malloc call with g_malloc.
  libqtest: refuse QTEST_QEMU_BINARY=qemu-kvm
  docs/devel/qgraph: add troubleshooting information
  libqos/qgraph: fix "UNAVAILBLE" typo
  gitlab-ci: Replace YAML anchors by extends (native_test_job)
  gitlab-ci: Replace YAML anchors by extends (native_build_job)
  gitlab-ci: Replace YAML anchors by extends (container_job)
  tests/docker/dockerfiles: Add ccache to containers where it was missing

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>