readline-6.3: Fix build on Mac OS X < 10.9

http://hydra.nixos.org/build/12476331

pkgs/development/libraries/readline/no-arch_only-6.3.patch

@@ -0,0 +1,13 @@
+diff -ru -x '*~' readline-6.3-orig/support/shobj-conf readline-6.3/support/shobj-conf
+--- support/shobj-conf	2014-02-24 03:06:29.000000000 +0100
++++ support/shobj-conf	2014-07-22 11:18:52.000000000 +0200
+@@ -194,9 +194,6 @@
+ 	# Darwin 8 == Mac OS X 10.4; Mac OS X 10.N == Darwin N+4
+ 	*)
+ 		case "${host_os}" in
+-		darwin[89]*|darwin1[012]*)
+-			SHOBJ_ARCHFLAGS='-arch_only `/usr/bin/arch`'
+-			;;
+ 		 *) 	# Mac OS X 10.9 (Mavericks) and later
+ 			SHOBJ_ARCHFLAGS=
+ 			# for 32 and 64bit universal library

pkgs/development/libraries/readline/readline6.3.nix

@@ -13,7 +13,9 @@ stdenv.mkDerivation (rec {
   patchFlags = "-p0";
 
   patches =
-    [ ./link-against-ncurses.patch ];
+    [ ./link-against-ncurses.patch
+      ./no-arch_only-6.3.patch
+    ];
 
   meta = {
     description = "GNU Readline, a library for interactive line editing";