Merge tag 'testing-pull-request-2022-08-30' of https://gitlab.com/thuth/qemu into...

Merge tag 'testing-pull-request-2022-08-30' of https://gitlab.com/thuth/qemu into staging

* First batch of patches to get qtests adapted for Windows
* Two preparation patches for the upcoming removal of the slirp submodule
* Some other small test fixes (typos, etc.)

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* tag 'testing-pull-request-2022-08-30' of https://gitlab.com/thuth/qemu: (23 commits)
  tests/avocado/migration: Get find_free_port() from the ports
  tests/qtest/ac97-test: Correct reference to driver
  gitlab-ci: Only use one process in Windows jobs for compilation
  docs/devel/testing: fix minor typo
  tests/avocado: Fix trivial typo
  tests/avocado: Do not run tests that require libslirp if it is not available
  tests/vm: Add libslirp to the VM tests
  tests/qtest: prom-env-test: Use double quotes to pass the prom-env option
  tests/qtest: npcm7xx_emc-test: Skip running test_{tx, rx} on win32
  tests/qtest: machine-none-test: Use double quotes to pass the cpu option
  tests/qtest: device-plug-test: Reverse the usage of double/single quotes
  tests/qtest: libqos: Rename malloc.h to libqos-malloc.h
  tests/qtest: libqos: Drop inclusion of <sys/wait.h>
  tests/qtest: migration-test: Skip running test_migrate_fd_proto on win32
  tests/qtest: i440fx-test: Skip running request_{bios, pflash} for win32
  tests/qtest: Build cases that use memory-backend-file for posix only
  tests/qtest: Build e1000e-test for posix only
  tests/qtest: Adapt {m48t59,rtc}-test cases for win32
  backends/tpm: Exclude headers and macros that don't exist on win32
  tests/qtest: migration-test: Handle link() for win32
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>