Change hash_custom_test to have a cleaner implementation (along the lines of

Peter Dimov's suggestion) and to only include the hash headers after declaring
the class.


[SVN r28394]

libs/functional

@@ -1 +1 @@
-Subproject commit b9f6765d15817f2cda1cf67bd2d1d36460e93b8a
+Subproject commit 65ece8bac069e1c437244a3954b52e86727bc977