tests/docker: update test-mingw to run single build

While the test-build test happily run for mingw the test-mingw case
runs more of the packaging inline with what our CI does. It however
fails if we don't find both compilers and expects to be run on a
docker image with both.

Remove that distinction and make it work more like the other build
test scripts.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20221011113417.794841-3-alex.bennee@linaro.org>
1 file changed