discount: enable various configureFlags

Shouldn't be harmfull.

pkgs/tools/text/discount/default.nix

@@ -1,4 +1,4 @@
-{stdenv, fetchurl}:
+{ stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
   version = "2.2.4";
@@ -12,6 +12,13 @@ stdenv.mkDerivation rec {
   patches = ./fix-configure-path.patch;
   configureScript = "./configure.sh";
 
+  configureFlags = [
+    "--enable-all-features"
+    "--pkg-config"
+    "--shared"
+    "--with-fenced-code"
+  ];
+
   meta = with stdenv.lib; {
     description = "Implementation of Markdown markup language in C";
     homepage = http://www.pell.portland.or.us/~orc/Code/discount/;