gitlab-ci: Increase the timeout for the cross-compiler builds

Some of the cross-compiler builds (the mips build and the win64 build
for example) are quite slow and sometimes hit the 1h time limit.
Increase the limit a little bit to make sure that we do not get failures
in the CI runs just because of some few minutes.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200921174320.46062-7-thuth@redhat.com>
Message-Id: <20200925154027.12672-15-alex.bennee@linaro.org>

.gitlab-ci.d/crossbuilds.yml

@@ -2,6 +2,7 @@
 .cross_system_build_job_template: &cross_system_build_job_definition
   stage: build
   image: $CI_REGISTRY_IMAGE/qemu/$IMAGE:latest
+  timeout: 80m
   script:
     - mkdir build
     - cd build