.gitlab-ci.d/crossbuilds.yml: Force 'make check' single-threaded for cross-i686-tci

The cross-i686-tci CI job is persistently flaky with various tests
hitting timeouts.  One theory for why this is happening is that we're
running too many tests in parallel and so sometimes a test gets
starved of CPU and isn't able to complete within the timeout.

(The environment this CI job runs in seems to cause us to default
to a parallelism of 9 in the main CI.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 20240912151003.2045031-1-peter.maydell@linaro.org
1 file changed