Fix building ASAN instrumented executables with custom entrypoints

base/win/BUILD.gn

 # Copyright (c) 2016 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.
 
 import("//build/buildflag_header.gni")
+import("//build/config/sanitizers/sanitizers.gni")
 import("//build/win/message_compiler.gni")
 
 declare_args() {
   # Indicates if the handle verifier should operate in a single module mode. By
   # default a single instance gets shared by all the modules.
   single_module_mode_handle_verifier = false
 }
 
 # Ensure that the handle verifier is always used in a single module mode for the
 # component builds.
@@ skipping 19 matching lines @@
 
   user_mode_logging = false
   compile_generated_code = false
 }
 shared_library("eventlog_provider") {
   sources = [
     "$root_gen_dir/base/win/eventlog_messages.rc",
     "eventlog_provider.cc",
   ]
 
-  ldflags = [ "/NOENTRY" ]
+  if (!is_asan) {
+    ldflags = [ "/NOENTRY" ]
+  }
 
   deps = [
     "//base/win:eventlog_messages",
   ]
 }