project.py: Python 3 compatibility

Change-Id: I2b98896b29a8f1b3b58f6a7bb713eb32f952ef16
diff --git a/tools/eclipse/project.py b/tools/eclipse/project.py
index 8ae67c5..2271f8d 100755
--- a/tools/eclipse/project.py
+++ b/tools/eclipse/project.py
@@ -188,7 +188,7 @@
 try:
   name = args.name if args.name else path.basename(ROOT)
   gen_project(name)
-  gen_classpath(retrieve_ext_location())
+  gen_classpath(retrieve_ext_location().decode('utf-8'))
 
 except KeyboardInterrupt:
   print('Interrupted by user', file=sys.stderr)