win: Fix always-rebuild of crashpad_snapshot_test_image_reader_module.dll

snapshot/snapshot_test.gyp

 # Copyright 2014 The Crashpad Authors. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 157 matching lines @@
         {
           'target_name': 'crashpad_snapshot_test_image_reader_module',
           'type': 'loadable_module',
           'dependencies': [
             '../client/client.gyp:crashpad_client',
             '../third_party/mini_chromium/mini_chromium.gyp:base',
           ],
           'sources': [
             'win/crashpad_snapshot_test_image_reader_module.cc',
           ],
+          'msvs_settings': {
+            'NoImportLibrary': 'true',
+          },
         },
       ],
     }],
   ],
 }