Merge tag 'tracing-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

Daniel's updated tracetool test suite that doesn't break Windows CI.

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# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
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* tag 'tracing-pull-request' of https://gitlab.com/stefanha/qemu:
  tracetool-test: allow to run in parallel
  qapi: switch to use QEMU_TEST_REGENERATE env var
  tracetool: drop the probe "__nocheck__" wrapping
  tracetool: add test suite for tracetool with reference output
  tracetool: include SPDX-License-Identifier in generated files
  tracetool: avoid space after "*" in arg types
  tracetool: eliminate trailing whitespace in C format
  checkpatch: cull trailing '*/' in SPDX check

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>