ghc821: 8.2.1-rc3 -> 8.2.1

(cherry picked from commit 0901dd50a2ed0d12b2bee8fdb147fdce5c1c5d69)
Signed-off-by: Domen Kožar <[e-mail]>

pkgs/development/compilers/ghc/8.2.1.nix

···
 
 let
   inherit (bootPkgs) ghc;
-  version = "8.2.1-rc3";
-  preReleaseName = "ghc-8.2.0.20170704";
+  version = "8.2.1";
+  preReleaseName = "ghc-8.2.1";
   commonBuildInputs = [ alex autoconf automake ghc happy hscolour perl python3 sphinx ];
   commonPreConfigure =  ''
     sed -i -e 's|-isysroot /Developer/SDKs/MacOSX10.5.sdk||' configure
···
 
   src = fetchurl {
     url = "https://downloads.haskell.org/~ghc/${version}/${preReleaseName}-src.tar.xz";
-    sha256 = "0ccfybbjrmd8yzqbfdqvb6clz2kd005wi8sx3mfjmbkmxv0l4jry";
+    sha256 = "1w4k0n23b9fg8kmarqhfamzpmf91p6jcdr6xlwzfmb4df2bd9hng";
   };
 
   postPatch = "patchShebangs .";