rhino: remove dependency on GCJ (#29759)

pkgs/development/libraries/java/rhino/default.nix

···
 
 let
   version = "1.7R2";
-  options = "-Dbuild.compiler=gcj";   # FIXME: We assume GCJ here.
 
   xbeans  = fetchurl {
     url = "http://archive.apache.org/dist/xmlbeans/binaries/xmlbeans-2.2.0.zip";
···
 
   buildInputs = [ unzip ant javac jvm ];
 
-  buildPhase = "ant ${options} jar";
+  buildPhase = "ant jar";
   doCheck    = false;
 
   # FIXME: Install javadoc as well.

pkgs/top-level/all-packages.nix

···
   resolv_wrapper = callPackage ../development/libraries/resolv_wrapper { };
 
   rhino = callPackage ../development/libraries/java/rhino {
-    javac = gcj;
-    jvm = gcj;
+    javac = jdk;
+    jvm = jre;
   };
 
   rlog = callPackage ../development/libraries/rlog { };