get rid of a bunch of windows jobs

(cherry picked from commit f9f515fb55)

.gitlab-ci.yml

@@ -7,6 +7,10 @@
 # Public License v. 2.0. If a copy of the MPL was not distributed
 # with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+default:
+# automatically cancels a job when a new pipeline for the same branch is triggered
+  interruptible: true
+
 stages:
   - checkformat
   - build