Add g++ install to branch job

.gitlab-ci.yml

@@ -48,6 +48,7 @@ BranchJobLinux:
   stage: linux
   image: maven:3-jdk-8
   script:
+  - apt-get update -q && apt-get install -y -q g++
   - mvn -Dmaven.wagon.http.ssl.insecure=true -Dmaven.wagon.http.ssl.allowall=true -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn -B  clean install --settings settings.xml
   - cat target/site/jacoco/index.html
   except: