src: rename macros.py to notrace_macros.py

This incarnation of macros.py is only used to disable the (d)trace
macros. Rename it so it better reflects its purpose. A new macros.py
will be added in a follow-up commit.

node.gyp

@@ -378,9 +378,8 @@
               ' and node_use_etw=="false"'
               ' and node_use_systemtap=="false"',
             {
-                'inputs': ['src/macros.py']
-              }
-              ],
+              'inputs': ['src/notrace_macros.py']
+            }],
             [ 'node_use_perfctr=="false"', {
               'inputs': [ 'src/perfctr_macros.py' ]
             }]