Do not depend on java.rmi.* when not necessary.

This is small correction of fix committed in r25814. We need to swap
terms in logical conjuction so java.rmi.* stuff is accessed only if
triggered by @Remote annotation.

No review.

src/compiler/scala/tools/nsc/backend/jvm/GenJVM.scala

@@ -880,8 +880,8 @@ abstract class GenJVM extends SubComponent with GenJVMUtil with GenAndroid with
      */
     private def addRemoteException(jmethod: JMethod, meth: Symbol) {
       val needsAnnotation = (
-           !(meth.throwsAnnotations contains RemoteExceptionClass)
-        && (isRemoteClass || (meth hasAnnotation RemoteAttr) && jmethod.isPublic)
+        (isRemoteClass || (meth hasAnnotation RemoteAttr) && jmethod.isPublic)
+          && !(meth.throwsAnnotations contains RemoteExceptionClass)
       )
       if (needsAnnotation) {
         val c   = Constant(RemoteExceptionClass.tpe)