osutil.c: include Python.h before the other headers
This is recommended by the Python documentation, since Python.h defines
some constants.
<item>
<title>#tag|escape#</title>
<link>{urlbase}{url}rev/{node|short}</link>
<description><![CDATA[#tag|strip|escape|addbreaks#]]></description>
<pubDate>#date|rfc822date#</pubDate>
</item>