fixed enhanced metafiles loading from files

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29915 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/enhmeta.h

@@ -61,7 +61,7 @@ public:
     void SetHENHMETAFILE(WXHANDLE hMF) { Free(); m_hMF = hMF; }
 
 protected:
-    void Init() { m_hMF = 0; }
+    void Init();
     void Free();
     void Assign(const wxEnhMetaFile& mf);