osutil.c: include Python.h before the other headers
This is recommended by the Python documentation, since Python.h defines
some constants.
#header#
<id>{urlbase}{url}atom-log/tip/{file|escape}</id>
<link rel="self" href="{urlbase}{url}atom-log/tip/{file|escape}"/>
<title>#repo|escape#: #file|escape# history</title>
#latestentry%feedupdated#
#entries%changelogentry#
</feed>