maybe synchronization will make it safer in multithreaded environments

Signed-off-by: kristof <Kristof.Szabados@ericsson.com>

org.eclipse.titanium/src/org/eclipse/titanium/metrics/preferences/PreferenceManager.java

@@ -29,7 +29,7 @@ public final class PreferenceManager {
 		// disabled constructor
 	}
 
-	public static IPreferenceStore getStore() {
+	public static synchronized IPreferenceStore getStore() {
 		if (store == null) {
 			store = Activator.getDefault().getPreferenceStore();
 		}