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
* Builds all projects within the workspace. Saves all editors prior to
     * build depending on user's preference.
     */
    public void run() {
        if (workbenchWindow == null) {
            
            return;
        }
        
        IProject[] roots = getWorkspaceProjects();
        if (roots.length < 1) {
			return;
		}
        
        
        if (!verifyBuildersAvailable(roots)) {
			return;
		}
        if (!verifyNoManualRunning()) {
			return;
		}
        
        BuildUtilities.saveEditors(null);
        
        doBuildOperation();
    }
    /**
     * Checks that there is at least one project with a builder registered on
     * it.
     */