glpk: 4.62 -> 4.63

See http://lists.gnu.org/archive/html/info-gnu/2017-07/msg00011.html
for release information

pkgs/development/libraries/glpk/default.nix

@@ -1,11 +1,11 @@
 { fetchurl, stdenv }:
 
 stdenv.mkDerivation rec {
-  name = "glpk-4.62";
+  name = "glpk-4.63";
 
   src = fetchurl {
     url = "mirror://gnu/glpk/${name}.tar.gz";
-    sha256 = "0w7s3869ybwyq9a4490dikpib1qp3jnn5nqz1vvwqy1qz3ilnvh9";
+    sha256 = "1xp7nclmp8inp20968bvvfcwmz3mz03sbm0v3yjz8aqwlpqjfkci";
   };
 
   doCheck = true;