another compilation fix for wxDFB STL build (#9754)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@54757 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/fontmgrcmn.cpp

@@ -24,9 +24,15 @@
 WX_DECLARE_LIST(wxFontInstance, wxFontInstanceList);
 WX_DEFINE_LIST(wxFontInstanceList)
 WX_DEFINE_LIST(wxFontBundleList)
+
 WX_DECLARE_HASH_MAP(wxString, wxFontBundle*,
                     wxStringHash, wxStringEqual,
-                    wxFontBundleHash);
+                    wxFontBundleHashBase);
+// in STL build, hash class is typedef to a template, so it can't be forward
+// declared, as we do; solve it by having a dummy class:
+class wxFontBundleHash : public wxFontBundleHashBase
+{
+};
 
 // ============================================================================
 // implementation