adjusted relative path composition for mac

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13892 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/helphtml.cpp

@@ -133,7 +133,11 @@ wxHTMLHelpControllerBase::LoadFile(const wxString& ifile)
          wxChar* f = wxGetWorkingDirectory();
          file = f;
          delete[] f; // wxGetWorkingDirectory returns new memory
+#ifdef __WXMAC__
+         file << ifile;
+#else
          file << WXEXTHELP_SEPARATOR << ifile;
+#endif
       }
       else
          file = ifile;