Turn off SchemaBuilder which breaks the build when using Buckminster

Error: file /var/lib/jenkins/jobs/C-MASTER-com.voclipse/workspace/eclipse.platform.releng.aggregator/eclipse.jdt.ui/org.eclipse.jdt.ui/schema/classpathFixProcessors.exsd, line 63: Referenced element 'enablement' is not defined
Error: file /var/lib/jenkins/jobs/C-MASTER-com.voclipse/workspace/eclipse.platform.releng.aggregator/eclipse.jdt.ui/org.eclipse.jdt.ui/schema/javaCompletionProposalComputer.exsd, line 156: Referenced element 'enablement' is not defined
Error: file /var/lib/jenkins/jobs/C-MASTER-com.voclipse/workspace/eclipse.platform.releng.aggregator/eclipse.jdt.ui/org.eclipse.jdt.ui/schema/quickAssistProcessors.exsd, line 60: Referenced element 'enablement' is not defined
Error: file /var/lib/jenkins/jobs/C-MASTER-com.voclipse/workspace/eclipse.platform.releng.aggregator/eclipse.jdt.ui/org.eclipse.jdt.ui/schema/quickFixProcessors.exsd, line 64: Referenced element 'enablement' is not defined