Adjust setup.py's install_requires about pex HOT 1 CLOSED

diff --git a/pex/pex_builder.py b/pex/pex_builder.py
index aef19e6..8b9911d 100644
--- a/pex/pex_builder.py
+++ b/pex/pex_builder.py
@@ -300,7 +300,7 @@ class PEXBuilder(object):
       raise RuntimeError('Failed to find setuptools while building pex!')

     for fn, content_stream in DistributionHelper.walk_data(setuptools):
-      if fn == 'pkg_resources.py' or fn.startswith('_markerlib'):
+      if fn.startswith('pkg_resources') or fn.startswith('_markerlib'):
         self._chroot.write(content_stream.read(), os.path.join(self.BOOTSTRAP_DIR, fn), 'resource')
         wrote_setuptools = True