entd: add libdl for dlopen and friends

SConstruct

 # -*- python -*-
 
 # Copyright (c) 2009-2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import os
 import re
 
 def build():
   vars = get_variables()
 
   env = get_environment(vars)
 
   env.AppendUnique(
     CCFLAGS=['-fPIC', '-fno-exceptions', '-Wall', '-Werror', '-ggdb'],
     LINKFLAGS=['-fPIC'],
     LIBS=['base',
           'rt',
+          'dl',
           'pthread',
           'v8',
           'event',
           'curl',
           'crypto',
           'opencryptoki',
           'chromeos',
           'crosapi'],
   )
 
@@ skipping 75 matching lines @@
   # copy all these vars to the build environment (UNIX process env, not just
   # scons "Environment").
   for key in vars.keys():
     env['ENV'][key] = env[key]
 
   env.VariantDir("${BUILD_DIR}", ".", duplicate=0)
 
   return env
 
 build()