aspell: use fetchzip instead of fetchTarball to fetch u-deva files

pkgs/development/libraries/aspell/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, fetchpatch, perl
+{ stdenv, fetchurl, fetchpatch, fetchzip, perl
 , searchNixProfiles ? true
 }:
 
@@ -6,7 +6,8 @@ let
 
   # Source for u-deva.cmap and u-deva.cset: use the Marathi
   # dictionary like Debian does.
-  devaMapsSource = fetchTarball {
+  devaMapsSource = fetchzip {
+    name = "aspell-u-deva";
     url = "ftp://ftp.gnu.org/gnu/aspell/dict/mr/aspell6-mr-0.10-0.tar.bz2";
     sha256 = "1v8cdl8x2j1d4vbvsq1xrqys69bbccd6mi03fywrhkrrljviyri1";
   };