make_metadata: Switch to use sdist_upip.

make_metadata.py

@@ -13,7 +13,7 @@ import sys
 sys.path.pop(0)
 from setuptools import setup
 sys.path.append("..")
-import optimize_upip
+import sdist_upip
 
 setup(name='micropython-%(dist_name)s',
       version='%(version)s',
@@ -25,7 +25,7 @@ setup(name='micropython-%(dist_name)s',
       maintainer=%(maintainer)r,
       maintainer_email='micro-python@googlegroups.com',
       license=%(license)r,
-      cmdclass={'optimize_upip': optimize_upip.OptimizeUpip},
+      cmdclass={'sdist': sdist_upip.sdist},
       %(_what_)s=[%(modules)s]%(_inst_req_)s)
 """