lli: Plug leaks in the remote target external implementation.

llvm-svn: 192031
diff --git a/llvm/tools/lli/RemoteTargetExternal.h b/llvm/tools/lli/RemoteTargetExternal.h
index 9a3644a..a4bfad2 100644
--- a/llvm/tools/lli/RemoteTargetExternal.h
+++ b/llvm/tools/lli/RemoteTargetExternal.h
@@ -88,7 +88,7 @@
   virtual void stop();
 
   RemoteTargetExternal(std::string &Name) : RemoteTarget(), ChildName(Name) {}
-  virtual ~RemoteTargetExternal() {}
+  virtual ~RemoteTargetExternal();
 
 private:
   std::string ChildName;