telling gnu id utils that .nix files should be treated as text

svn path=/nixpkgs/trunk/; revision=14237

pkgs/tools/misc/idutils/default.nix

@@ -11,6 +11,8 @@ stdenv.mkDerivation rec {
 
   doCheck = true;
 
+  patches = [ ./nix-mapping.patch ];
+
   meta = {
     description = "GNU Idutils, a text searching utility";
 

pkgs/tools/misc/idutils/nix-mapping.patch

@@ -0,0 +1,10 @@
+diff --git a/libidu/id-lang.map b/libidu/id-lang.map
+index 7edb860..6dccd28 100644
+--- a/libidu/id-lang.map
++++ b/libidu/id-lang.map
+@@ -92,3 +92,5 @@ Makefile.*		make
+ 
+ *.gz			FILTER gzip -d <%s
+ *.Z			FILTER gzip -d <%s
++
++*.nix			text