Remove java in the jvm options in order to avoid copyright problems (thanks to @System0x20 suggestion).

Author: viferga

source/loaders/java_loader/source/java_loader_impl.cpp

@@ -134,7 +134,7 @@ loader_impl_data java_loader_impl_initialize(loader_impl impl, configuration con
 		static const size_t options_size = 2;
 
 		JavaVMOption * options = new JavaVMOption[options_size]; // JVM invocation options
-		options[0].optionString = "-Djava.polyglot.name=metacall";
+		options[0].optionString = "-Dmetacall.polyglot.name=core";
 		options[1].optionString = "-Djava.class.path=" TEST_CLASS_PATH;
 
 		JavaVMInitArgs vm_args;

source/ports/scala_port/src/main/scala/Caller.scala

@@ -35,7 +35,7 @@ object Caller {
       filePaths: Vector[String]
   )
 
-  private val runningInMetacall = System.getProperty("java.polyglot.name") == "metacall"
+  private val runningInMetacall = System.getProperty("metacall.polyglot.name") == "core"
 
   private def callLoop() = {
     if (!runningInMetacall)