Fix recently introduced compilation error in wxUSE_PALETTE==0 build.

Add missing "#if wxUSE_PALETTE" tests.

Closes #16083.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76146 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/imagbmp.cpp

@@ -271,7 +271,9 @@ bool wxBMPHandler::SaveDib(wxImage *image,
         }
     }
 
+#if wxUSE_PALETTE
     wxScopedPtr<wxPalette> palette; // entries for quantized images
+#endif // wxUSE_PALETTE
     wxScopedArray<wxUint8> rgbquad; // for the RGBQUAD bytes for the colormap
     wxScopedPtr<wxImage> q_image;   // destination for quantized image
 
@@ -287,10 +289,15 @@ bool wxBMPHandler::SaveDib(wxImage *image,
             // I get a delete error using Quantize when desired colors > 236
             int quantize = ((palette_size > 236) ? 236 : palette_size);
             // fill the destination too, it gives much nicer 4bpp images
+#if wxUSE_PALETTE
             wxPalette* paletteTmp;
             wxQuantize::Quantize( *image, *q_image, &paletteTmp, quantize, 0,
                                   wxQUANTIZE_FILL_DESTINATION_IMAGE );
             palette.reset(paletteTmp);
+#else // !wxUSE_PALETTE
+            wxQuantize::Quantize( *image, *q_image, NULL, quantize, 0,
+                                  wxQUANTIZE_FILL_DESTINATION_IMAGE );
+#endif // wxUSE_PALETTE/!wxUSE_PALETTE
         }
         else
         {