Stopgap measure to fix compilation error on Windows

Somehow <windows.h> gets included here and it #defines GetMetaFile as
GetMetaFileA. Undo that.

Change-Id: Ia99c077ef7b3f845efabaf286f12e2688fe4a132

svx/source/svdraw/svdograf.cxx

@@ -1098,6 +1098,10 @@ GDIMetaFile SdrGrafObj::getMetafileFromEmbeddedVectorGraphicData() const
     return aRetval;
 }
 
+#ifdef _WIN32
+#undef GetMetaFile
+#endif
+
 GDIMetaFile SdrGrafObj::GetMetaFile(GraphicType &rGraphicType) const
 {
     if (isEmbeddedVectorGraphicData())