Bump cabal-install to v1.22.5.0

cabal-install/cabal-install.cabal

 Name:               cabal-install
-Version:            1.22.4.0
+Version:            1.22.5.0
 Synopsis:           The command-line interface for Cabal and Hackage.
 Description:
     The \'cabal\' command-line program simplifies the process of managing

cabal-install/changelog

 -*-change-log-*-
+1.22.5.0 Ryan Thomas <ryan@ryant.org> June 2015
+	* Reduce temporary directory name length, fixes #2502. (Edward Z. Yang)
+
 1.22.4.0 Ryan Thomas <ryan@ryant.org> May 2015
 	* Force cabal upload to always use digest auth and never basic auth.
 	* Add dependency-graph information to `printPlan` output