Make test/cxxflags use a user define instead of __OPTIMIZE__

test/cxxflags/gyptest-cxxflags.py

Index: test/cxxflags/gyptest-cxxflags.py
diff --git a/test/cxxflags/gyptest-cxxflags.py b/test/cxxflags/gyptest-cxxflags.py
index b8bed7f9c2c5a6c102e1ea2a70adf46f08ef309a..117a1800de49d3202a0244a9822140c80585940d 100755
--- a/test/cxxflags/gyptest-cxxflags.py
+++ b/test/cxxflags/gyptest-cxxflags.py
@@ -20,25 +20,25 @@ test = TestGyp.TestGyp(formats=FORMATS)
 
 # We reset the environ after calling gyp. When the auto-regeneration happens,
 # the same define should be reused anyway.
-with TestGyp.LocalEnv({'CXXFLAGS': '-O0'}):
+with TestGyp.LocalEnv({'CXXFLAGS': ''}):
   test.run_gyp('cxxflags.gyp')
 
 test.build('cxxflags.gyp')
 
 expect = """\
-Using no optimization flag
+No define
 """
 test.run_built_executable('cxxflags', stdout=expect)
 
 test.sleep()
 
-with TestGyp.LocalEnv({'CXXFLAGS': '-O2'}):
+with TestGyp.LocalEnv({'CXXFLAGS': '-DABC'}):
   test.run_gyp('cxxflags.gyp')
 
 test.build('cxxflags.gyp')
 
 expect = """\
-Using an optimization flag
+With define
 """
 test.run_built_executable('cxxflags', stdout=expect)