test/dl: no warnings

* test/dl/test_base.rb, test/dl/test_c_struct_entry.rb: deprecation
  warnings make no sense here.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37966 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/dl/test_base.rb

@@ -1,6 +1,7 @@
+# -*- coding: us-ascii -*-
 require 'test/unit'
-require 'dl'
 require_relative '../ruby/envutil'
+EnvUtil.suppress_warning {require 'dl'}
 
 libc_so = libm_so = nil
 

test/dl/test_c_struct_entry.rb

@@ -1,6 +1,7 @@
+# -*- coding: us-ascii -*-
 require_relative 'test_base'
 
-require 'dl/struct'
+EnvUtil.suppress_warning {require 'dl/struct'}
 
 module DL
   class TestCStructEntity < TestBase

test/ruby/envutil.rb

@@ -1,3 +1,4 @@
+# -*- coding: us-ascii -*-
 require "open3"
 require "timeout"