do not examine directories for being empty when adding them - speeds up LMMS-startup a lot

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@889 0778d3d1-df1d-0410-868b-ea421aaaa00d

include/file_browser.h

@@ -53,9 +53,6 @@ public:
 							QWidget * _parent );
 	virtual ~fileBrowser();
 
-	static bool isDirWithContent( const QString & _path,
-						const QString & _filter );
-
 
 public slots:
 	void reloadTree( void );