Fix gitlab-ci for 64 bits builds

.gitlab-ci.yml

@@ -4,6 +4,7 @@ before_script:
   - dpkg --add-architecture i386
   - apt-get update
   - apt-get install libx11-dev:i386 libc6-dev-i386 build-essential  -y
+  - apt-get install libx11-dev libc6-dev build-essential  -y
 
 smoke-test-by-make:
   stage: build