Silence deprecation warning in WindowCacheConfig

Change-Id: I923b65efeaacc5e9cc8aecc754ab8d8e63ccd2e5
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/storage/file/WindowCacheConfig.java

@@ -221,6 +221,7 @@ public class WindowCacheConfig {
 	 *
 	 * @since 3.0
 	 */
+	@SuppressWarnings("deprecation")
 	public void install() {
 		WindowCache.reconfigure(this);
 	}