Bug 273147 [Build] Report build problems as ERROR severity
Currently the BuildManager reports problems with severity of WARNING. Warnings are no longer surfaced in the UI, so we should increase this severity to ERROR.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/actions/GlobalBuildAction.java
if (buildType == IncrementalProjectBuilder.INCREMENTAL_BUILD) {
			return IDEWorkbenchMessages.GlobalBuildAction_buildOperationTitle;
		}
        return IDEWorkbenchMessages.GlobalBuildAction_rebuildAllOperationTitle;
    }
    /**
     * Builds all projects within the workspace. Does not save any open editors.
     */
    public void doBuild() {
        doBuildOperation();
    }
    /**
     * Invokes a build on all projects within the workspace. Reports any errors
     * with the build to the user.
     */
    void doBuildOperation() {
        Job buildJob = new Job(IDEWorkbenchMessages.GlobalBuildAction_jobTitle) {
            /*
             * (non-Javadoc)
             * 
             * @see org.eclipse.core.runtime.jobs.Job#run(org.eclipse.core.runtime.IProgressMonitor)
             */
            protected IStatus run(IProgressMonitor monitor) {
                final MultiStatus status = new MultiStatus(
                        PlatformUI.PLUGIN_ID, 0, IDEWorkbenchMessages.GlobalBuildAction_buildProblems,
                        null);
                monitor.beginTask(getOperationMessage(), 100);
                try {
                    ResourcesPlugin.getWorkspace().build(buildType,
                            new SubProgressMonitor(monitor, 100));