Don't DLL-export the private wxSimpleFontEnumerator class.

This class is only used internally, so there is no need to export it from the
shared library.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76903 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/fontenumcmn.cpp

@@ -33,7 +33,7 @@
 
 // A simple wxFontEnumerator which doesn't perform any filtering and
 // just returns all facenames and encodings found in the system
-class WXDLLEXPORT wxSimpleFontEnumerator : public wxFontEnumerator
+class wxSimpleFontEnumerator : public wxFontEnumerator
 {
 public:
     wxSimpleFontEnumerator() { }