Use cache of cirrus caching msys2
The install of msys2 are refer to https://github.com/msys2/setup-msys2
The first time install msys2 would be time consuming, so increase timeout_in to 90m
according to https://cirrus-ci.org/faq/#instance-timed-out

Apply patch of https://lists.gnu.org/archive/html/qemu-devel/2020-10/msg00072.html



[AJB: renamed printenv_script to setup_script]

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20201007145300.1197-2-luoyonggang@gmail.com>
Message-Id: <20201007160038.26953-5-alex.bennee@linaro.org>