[libfuzzer] marking libfuzzer symbols as dynamic on mac.

testing/libfuzzer/fuzzer_test.gni

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Defines fuzzer_test.
 #
 import("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//testing/test.gni")
 
@@ skipping 100 matching lines @@
       forward_variables_from(invoker,
                              [
                                "sources",
                                "include_dirs",
                              ])
       deps = test_deps
 
       if (defined(invoker.additional_configs)) {
         configs += invoker.additional_configs
       }
+      configs += [ "//testing/libfuzzer:fuzzer_test_config" ]
     }
   } else {
     # noop on unsupported platforms.
     # mark attributes as used.
     assert(invoker.sources == [] || invoker.sources != [])
     if (defined(invoker.additional_configs)) {
       assert(
           invoker.additional_configs == [] || invoker.additional_configs != [])
     }
     if (defined(invoker.deps)) {
       assert(invoker.deps == [] || invoker.deps != [])
     }
     if (defined(invoker.dict)) {
       assert(invoker.dict == [] || invoker.dict != [])
     }
     if (defined(invoker.libfuzzer_options)) {
       assert(invoker.libfuzzer_options == [] || invoker.libfuzzer_options != [])
     }
     if (defined(invoker.seed_corpus)) {
       assert(invoker.seed_corpus == [] || invoker.seed_corpus != [])
     }
 
     group(target_name) {
     }
   }
 }