linux: in module test, pass -ldl as a library not ldflag

test/module/src/module.gyp

 # Copyright (c) 2009 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'target_defaults': {
     'conditions': [
       ['OS=="win"', {
         'defines': ['PLATFORM_WIN'],
       }],
       ['OS=="mac"', {
         'defines': ['PLATFORM_MAC'],
       }],
       ['OS=="linux"', {
         'defines': ['PLATFORM_LINUX'],
         # Support 64-bit shared libs (also works fine for 32-bit).
         'cflags': ['-fPIC'],
-        'ldflags': ['-ldl'],
+        'libraries': ['-ldl'],
       }],
     ],
   },
   'targets': [
     {
       'target_name': 'program',
       'type': 'executable',
       'dependencies': [
         'lib1',
         'lib2',
@@ skipping 17 matching lines @@
       'product_name': 'lib2',
       'product_prefix': '',
       'type': 'loadable_module',
       'xcode_settings': {'OTHER_LDFLAGS': ['-dynamiclib'], 'MACH_O_TYPE': ''},
       'sources': [
         'lib2.c',
       ],
     },
   ],
 }