Don't serialize linking for the make generator by default

test/make_global_settings/basics/gyptest-make_global_settings.py

 #!/usr/bin/env python
 
 # Copyright (c) 2013 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.
 
 """
 Verifies make_global_settings.
 """
 
 import os
 import sys
 import TestGyp
 
 test_format = ['ninja']
 if sys.platform in ('linux2', 'darwin'):
   test_format += ['make']
 
 test = TestGyp.TestGyp(formats=test_format)
 
 test.run_gyp('make_global_settings.gyp')
 
 if test.format == 'make':
   cc_expected = """ifneq (,$(filter $(origin CC), undefined default))
   CC = $(abspath clang)
 endif
 """
   if sys.platform == 'linux2':
     link_expected = """
-LINK ?= flock $(builddir)/linker.lock $(abspath clang)
+LINK ?= $(abspath clang)
 """
   elif sys.platform == 'darwin':
     link_expected = """
-LINK ?= ./gyp-mac-tool flock $(builddir)/linker.lock $(abspath clang)
+LINK ?= $(abspath clang)
 """
   test.must_contain('Makefile', cc_expected)
   test.must_contain('Makefile', link_expected)
 if test.format == 'ninja':
   cc_expected = 'cc = ' + os.path.join('..', '..', 'clang')
   ld_expected = 'ld = $cc'
   if sys.platform == 'win32':
     ld_expected = 'link.exe'
   test.must_contain('out/Default/build.ninja', cc_expected)
   test.must_contain('out/Default/build.ninja', ld_expected)
 
 test.pass_test()