rm-old-base: restore older catchIO

This needs to be included so running with older bases and ghcs can be
done even while building cabal itself demands recent ghcs.

Author: NadiaYvette

templates/Paths_pkg.template.hs

@@ -38,7 +38,11 @@ import System.Environment (getExecutablePath)
 {% if supportsCpp %}
 #if defined(VERSION_base)
 
+#if MIN_VERSION_base(4,0,0)
 catchIO :: IO a -> (Exception.IOException -> IO a) -> IO a
+#else
+catchIO :: IO a -> (Exception.Exception -> IO a) -> IO a
+#endif
 
 #else
 catchIO :: IO a -> (Exception.IOException -> IO a) -> IO a