Restore the ABI breakage by bringing back a removed private static variable.

taglib/toolkit/tstring.cpp

@@ -787,6 +787,12 @@ void String::detach()
   if(d->count() > 1)
     String(d->data.c_str()).swap(*this);
 }
+
+////////////////////////////////////////////////////////////////////////////////
+// private members
+////////////////////////////////////////////////////////////////////////////////
+
+const String::Type String::WCharByteOrder = wcharByteOrder();
 }
 
 ////////////////////////////////////////////////////////////////////////////////

taglib/toolkit/tstring.h

@@ -536,6 +536,13 @@ namespace TagLib {
     void detach();
 
   private:
+    /*!
+     * \deprecated This variable is no longer used, but NEVER remove this. It
+     * may lead to a linkage error.
+     */
+     // BIC: remove
+    static const Type WCharByteOrder;
+
     class StringPrivate;
     StringPrivate *d;
   };