Import local gyp.py, then fallback to system

gyp_main.py

Index: gyp_main.py
diff --git a/gyp_main.py b/gyp_main.py
index 4ec872f0f95aa3840967f8951e7e6448477e7d64..fc1fff1968c6151416081102fa6754004463a059 100755
--- a/gyp_main.py
+++ b/gyp_main.py
@@ -8,10 +8,11 @@ import sys
 
 # TODO(mark): sys.path manipulation is some temporary testing stuff.
 try:
+  import os.path
+  sys.path = [ os.path.join(os.path.dirname(sys.argv[0]), 'pylib') ] + sys.path
+
   import gyp
 except ImportError, e:
-  import os.path
-  sys.path.append(os.path.join(os.path.dirname(sys.argv[0]), 'pylib'))
   import gyp
 
 if __name__ == '__main__':