Medialibrary: publish clearDatabase method

(cherry picked from commit f7e12af9)

medialibrary/src/org/videolan/medialibrary/interfaces/AbstractMedialibrary.java

@@ -655,6 +655,7 @@ abstract public class AbstractMedialibrary {
     abstract public AbstractMediaWrapper[] lastMediaPlayed();
     abstract public AbstractMediaWrapper[] lastStreamsPlayed();
     abstract public boolean clearHistory();
+    abstract public void clearDatabase(boolean restorePlaylist);
     abstract public boolean addToHistory(String mrl, String title);
     abstract public AbstractMediaWrapper getMedia(long id);
     abstract public AbstractMediaWrapper getMedia(Uri uri);

medialibrary/src/org/videolan/medialibrary/stubs/StubMedialibrary.java

@@ -330,6 +330,9 @@ public class StubMedialibrary extends AbstractMedialibrary {
         return true;
     }
 
+    @Override
+    public void clearDatabase(boolean restorePlaylist) {}
+
     //TODO what if two files have the same name ??
     // TODO what happens in case of false return
     public boolean addToHistory(String mrl, String title) {