verilog: update from 0.9.3 to 0.9.7

pkgs/applications/science/electronics/verilog/default.nix

@@ -1,11 +1,11 @@
 {stdenv, fetchurl, gperf, flex, bison}:
 
 stdenv.mkDerivation rec {
-  name = "verilog-0.9.3";
+  name = "verilog-0.9.7";
 
   src = fetchurl {
     url = "mirror://sourceforge/iverilog/${name}.tar.gz";
-    sha256 = "dd68c8ab874a93805d1e93fa76ee1e91fc0c7b20822ded3e57b6536cd8c0d1ba";
+    sha256 = "0m3liqw7kq24vn7k8wvi630ljz0awz23r3sd4rcklk7vgghp4pks";
   };
 
   buildInputs = [ gperf flex bison ];