blind fix for OSX

Change-Id: I7050057e5fa6da5bb5517713f6cbbfa60e47984b

vcl/inc/quartz/salgdi.h

@@ -217,6 +217,8 @@ public:
     // InvalidateContext does an UnsetState and sets mrContext to 0
     void                    InvalidateContext();
 
+    virtual SalGraphicsImpl* GetImpl() const SAL_OVERRIDE;
+
     virtual bool            setClipRegion( const vcl::Region& ) SAL_OVERRIDE;
 
     // draw --> LineColor and FillColor and RasterOp and ClipRegion

vcl/quartz/salgdi.cxx

@@ -315,6 +315,11 @@ AquaSalGraphics::~AquaSalGraphics()
     }
 }
 
+SalGraphicsImpl* AquaSalGraphics::GetImpl() const
+{
+    return NULL;
+}
+
 void AquaSalGraphics::SetTextColor( SalColor nSalColor )
 {
     maTextColor = RGBAColor( nSalColor );