makemkv: add jre_headless PATH through the wrapper

MakeMKV requires a Java runtime environment to extract some Blu-ray
disks:

http://www.makemkv.com/bdjava/

This change provides jre_headless by default.

pkgs/applications/video/makemkv/default.nix

@@ -7,6 +7,9 @@
 , openssl
 , qtbase
 , zlib
+
+, withJava ? true
+, jre_headless
 }:
 
 let
@@ -38,6 +41,13 @@ in mkDerivation {
 
   buildInputs = [ ffmpeg_3 openssl qtbase zlib ];
 
+  qtWrapperArgs =
+    let
+      binPath = stdenv.lib.makeBinPath [ jre_headless ];
+    in stdenv.lib.optionals withJava [
+      ''--prefix PATH : ${binPath}''
+    ];
+
   installPhase = ''
     runHook preInstall