Allow real jobs to fail

 + Distributions with pretty old compiler may not be supported, we
 ignore this

.gitlab-ci.yml

@@ -65,7 +65,7 @@ debian:
   stage: real
   image: ocaml/opam:debian
   script: "export OC_NOTEST=true; ./gitlab-ci.sh system"
-  allow_failure: false
+  allow_failure: true
 
 centos:
   before_script:
@@ -73,7 +73,7 @@ centos:
   stage: real
   image: ocaml/opam:centos
   script: "export OC_NOTEST=true; ./gitlab-ci.sh system"
-  allow_failure: false
+  allow_failure: true
 
 fedora:
   before_script:
@@ -81,10 +81,10 @@ fedora:
   stage: real
   image: ocaml/opam:fedora
   script: "export OC_NOTEST=true; ./gitlab-ci.sh system"
-  allow_failure: false
+  allow_failure: true
 
 opensuse:
   stage: real
   image: ocaml/opam:opensuse
   script: "export OC_NOTEST=true; ./gitlab-ci.sh system"
-  allow_failure: false
+  allow_failure: true