Revert parts of r5021, OpenAL also uses the Volume slider.

This now enables/disables the slider, depending on chosen Backend. Linux and OSX can now also use the slider to change the Volume of OpenAL. Other Backends do not support Volume changes.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5026 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Plugins/Plugin_DSP_LLE/Src/DSPConfigDlgLLE.h

@@ -40,10 +40,8 @@ public:
 private:
     DECLARE_EVENT_TABLE();
 
-#ifdef _WIN32
 	wxSlider *m_volumeSlider;
 	wxStaticText *m_volumeText;    
-#endif
     wxButton *m_OK;
     wxCheckBox *m_buttonEnableDTKMusic;
     wxCheckBox *m_buttonEnableThrottle;
@@ -61,9 +59,9 @@ private:
     
     void OnOK(wxCommandEvent& event);
     void SettingsChanged(wxCommandEvent& event);
-#ifdef _WIN32
 	void VolumeChanged(wxScrollEvent& event);
-#endif
+	bool SupportsVolumeChanges(std::string backend);
+	void BackendChanged(wxCommandEvent& event);
 };
 
 #endif //__DSP_LLE_CONFIGDIALOG_h__