Create wxBitmap compatible with wxDC only for wxMSW

Ctor creating wxBitmap compatible with wxDC is available only for wxMSW.

src/propgrid/advprops.cpp

@@ -1891,7 +1891,11 @@ void wxImageFileProperty::OnCustomPaint( wxDC& dc,
         {
             wxImage imgScaled = m_image;
             imgScaled.Rescale(rect.width, rect.height);
+#ifdef __WSMSW__
             m_bitmap = wxBitmap(imgScaled, dc);
+#else
+            m_bitmap = wxBitmap(imgScaled);
+#endif
         }
     }