fs/Traits.hxx: move definition of AllocatedPath::string to PathTraits

src/fs/AllocatedPath.hxx

@@ -37,8 +37,7 @@ class Error;
  * stored.
  */
 class AllocatedPath {
-	typedef std::string string;
-
+	typedef PathTraits::string string;
 	typedef PathTraits::value_type value_type;
 	typedef PathTraits::pointer pointer;
 	typedef PathTraits::const_pointer const_pointer;

src/fs/Traits.hxx

@@ -36,6 +36,7 @@
  * This class describes the nature of a filesystem path.
  */
 struct PathTraits {
+	typedef std::string string;
 	typedef char value_type;
 	typedef char *pointer;
 	typedef const char *const_pointer;