Qt4: fix disc dialog on Linux (again)

5a2390a7 is the first bad commit
commit 5a2390a7
Author: Jean-Baptiste Kempf <jb@videolan.org>
Date:   Sat Mar 31 22:20:58 2012 +0200
(cherry picked from commit 0041fd5c)

modules/gui/qt4/components/open_panels.cpp

@@ -371,10 +371,10 @@ DiscOpenPanel::DiscOpenPanel( QWidget *_parent, intf_thread_t *_p_intf ) :
     updateButtons();
 }
 
+#ifdef WIN32 /* Disc drives probing for Windows */
 void DiscOpenPanel::onFocus()
 {
     ui.deviceCombo->clear();
-#ifdef WIN32 /* Disc drives probing for Windows */
     wchar_t szDrives[512];
     szDrives[0] = '\0';
     if( GetLogicalDriveStringsW( sizeof( szDrives ) - 1, szDrives ) )
@@ -403,8 +403,8 @@ void DiscOpenPanel::onFocus()
         }
         SetErrorMode(oldMode);
     }
-#endif
 }
+#endif
 
 DiscOpenPanel::~DiscOpenPanel()
 {

modules/gui/qt4/components/open_panels.hpp

@@ -174,7 +174,9 @@ public:
     virtual ~DiscOpenPanel();
     virtual void clear() ;
     virtual void accept() ;
+#ifdef WIN32
     void onFocus();
+#endif
 private:
     Ui::OpenDisk ui;
     char *psz_dvddiscpath, *psz_vcddiscpath, *psz_cddadiscpath;