Only use scaled content factor for bitmaps on Mac

src/propgrid/propgrid.cpp

@@ -4660,7 +4660,12 @@ void wxPropertyGrid::OnResize( wxSizeEvent& event )
 
     if ( !HasExtraStyle(wxPG_EX_NATIVE_DOUBLE_BUFFERING) )
     {
+        // Scaled bitmaps only work on Mac currently
+#ifdef __WXOSX_COCOA__
         double scaleFactor = GetContentScaleFactor();
+#else
+        double scaleFactor = 1.0;
+#endif
         int dblh = (m_lineHeight*2);
         if ( !m_doubleBuffer )
         {

src/richtext/richtextbuffer.cpp

@@ -12681,8 +12681,11 @@ bool wxRichTextImage::LoadAndScaleImageCache(wxImage& image, const wxSize& sz, w
         else
         {
             double scaleFactor = 1.0;
+            // Scaled bitmaps only work on Mac currently
+#ifdef __WXOSX_COCOA__
             if (context.GetBuffer() && context.GetBuffer()->GetRichTextCtrl())
                 scaleFactor = context.GetBuffer()->GetRichTextCtrl()->GetContentScaleFactor();
+#endif
 
             // If the original width and height is small, e.g. 400 or below,
             // scale up and then down to improve image quality. This can make