disable frozen-string-literal

* lib/mkmf.rb, lib/shellwords.rb: disable frozen-string-literal.
  [ruby-core:72011] [Bug #11800]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53020 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Dec 10 09:32:51 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/mkmf.rb, lib/shellwords.rb: disable frozen-string-literal.
+	  [ruby-core:72011] [Bug #11800]
+
 Thu Dec 10 06:33:39 2015  Eric Wong  <e@80x24.org>
 
 	* marshal.c (memsize_dump_arg): remove NULL check

lib/mkmf.rb

@@ -1,4 +1,5 @@
 # -*- coding: us-ascii -*-
+# frozen-string-literal: false
 # module to create Makefile for extension modules
 # invoke like: ruby -r mkmf extconf.rb
 

lib/shellwords.rb

@@ -1,3 +1,4 @@
+# frozen-string-literal: false
 ##
 # == Manipulates strings like the UNIX Bourne shell
 #