gmp: 6.1.1 -> 6.1.2

pkgs/development/libraries/gmp/6.x.nix

@@ -3,11 +3,11 @@
 let inherit (stdenv.lib) optional optionalString; in
 
 let self = stdenv.mkDerivation rec {
-  name = "gmp-6.1.1";
+  name = "gmp-6.1.2";
 
   src = fetchurl { # we need to use bz2, others aren't in bootstrapping stdenv
     urls = [ "mirror://gnu/gmp/${name}.tar.bz2" "ftp://ftp.gmplib.org/pub/${name}/${name}.tar.bz2" ];
-    sha256 = "1mpzprdzkgfpdc1v2lf4dxlxps4x8bvmzvd8n1ri6gw9y9jrh458";
+    sha256 = "1clg7pbpk6qwxj5b2mw0pghzawp2qlm3jf9gdd8i6fl6yh2bnxaj";
   };
 
   #outputs TODO: split $cxx due to libstdc++ dependency