Move LdPreload include to correct place

tests/acceptance/proxy_tests.rb

@@ -1,8 +1,12 @@
 
 require 'flexnbd/fake_source'
 require 'flexnbd/fake_dest'
+require 'ld_preload'
 
 module ProxyTests
+
+  include LdPreload
+
   def b
     "\xFF".b
   end

tests/acceptance/test_proxy_mode.rb

@@ -1,11 +1,9 @@
 require 'test/unit'
 require 'environment'
-require 'ld_preload'
 require 'proxy_tests'
 
 class TestProxyMode < Test::Unit::TestCase
 
-  include LdPreload
   include ProxyTests
 
   def setup