osutil.c: include Python.h before the other headers
This is recommended by the Python documentation, since Python.h defines
some constants.
<entry>
<title>#tag|escape#</title>
<link rel="alternate" href="{urlbase}{url}rev/{node}"/>
<id>http://www.selenic.com/mercurial/#tag-{node}</id>
<updated>#date|rfc3339date#</updated>
<published>#date|rfc3339date#</published>
<content type="text">#tag|strip|escape#</content>
</entry>