Allow rebuilding mingw also with older docker versions.

* docker/gpg4win-trixie/mingw-pthread-run-reverse-order.patch: New.
* docker/gpg4win-trixie/Dockerfile: Changed.

Updates-commit: 9d75a10c17adb2986b4fd9c93a50e8980f86a248

Our docker instalaltion comes with out the ADD checksum option and
thus it is better to keep the patch in our repo.