[ruby/irb] Changed to call Kernel.print

If you call `binding.irb` on a class defined `#print`, it will crash, so call `Kernel.print`.

Fix [Bug #18389] `binding.irb` can fail in some classes that implement `context` and `print` methods.

https://github.com/ruby/irb/commit/d54b271984

lib/irb/extend-command.rb

@@ -235,7 +235,7 @@ module IRB # :nodoc:
           alias_method to, from
         }
       else
-        print "irb: warn: can't alias #{to} from #{from}.\n"
+        Kernel.print "irb: warn: can't alias #{to} from #{from}.\n"
       end
     end