Fix only detecting the revision number of the setup directory, not the highest revision number for the project as a whole.
Fix only detecting the revision number of the setup directory, not the
highest revision number for the project as a whole.

--HG--
branch : setuptools
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/trunk/setuptools%4041129

pypa/setuptools,pypa/setuptools,pypa/setuptools