patch for Dh_Haskell.sh in haskell-devscripts-0.8.3

[David Fox <ddssff@gmail.com>]

Attached is a patch that changes an occurrence of ghc-pkg6 to ghc-pkg.
 This led to incorrect binary dependencies in some packages.

--- x/Dh_Haskell.sh.orig	2011-01-15 07:56:23.000000000 -0800
+++ x/Dh_Haskell.sh	2011-04-18 08:53:42.403188183 -0700
@@ -21,7 +21,7 @@
 }
 
 ghc_pkg_field(){
-    ghc-pkg6 --global field $@ | head -n1
+    ghc-pkg --global field $@ | head -n1
 }
 
 providing_package_for_ghc(){