Remove Raspbian job

 + Creates problems with GitLab CI

.gitlab-ci.yml

@@ -88,9 +88,3 @@ opensuse:
   image: ocaml/opam:opensuse
   script: "export OC_NOTEST=true; ./gitlab-ci.sh system"
   allow_failure: false
-
-raspbian:
-  stage: real
-  image: ocaml/opam:raspbian
-  script: "export OC_NOTEST=true; ./gitlab-ci.sh system"
-  allow_failure: false