final target should be based on data_dir, not build_dir

Author: vandome

wellies/data.py

@@ -149,7 +149,7 @@ def __init__(self, data_dir, name, options, build_dir=None):
         else:
             if not isinstance(files, list):
                 files = [files]
-            files = [os.path.join(build_dir, name, f) for f in files]
+            files = [os.path.join(data_dir, name, f) for f in files]
             script = [
                 pf.TemplateScript(
                     scripts.git_script,