Fix typo in symlink handling code.

--HG--
branch : setuptools
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/trunk/setuptools%4041235

setuptools/command/easy_install.py

@@ -849,7 +849,7 @@ See the setuptools documentation for the "develop" command for more info.
                 # Ensure that setuptools itself never becomes unavailable!
                 # XXX should this check for latest version?
                 filename = os.path.join(self.install_dir,'setuptools.pth')
-                if os.path.islink(filename): unlink(filename)
+                if os.path.islink(filename): os.unlink(filename)
                 f = open(filename, 'wt')
                 f.write(dist.location+'\n')
                 f.close()