pstree: version bump from 2.33 to 2.36

tarball for 2.33 is no longer downloadable.

changelog (excerpt from pstree.c):

 * Revision 2.36  2013-04-12 11:47:03+02  fred
 * Some processes like apache under a recent Linux were listed with UID
 * root instead of the correct UID, as they use setuid(). We now read the
 * UID from the owner of /proc/PID instead of /proc/PID/stat, as this
 * seems to be updated correctly. Thanks to Tom Schmidt
 * <tschmidt AT micron.com> for pointing out this bug.
 
 * Revision 2.35  2013-02-28 08:33:02+01  fred
 * Added Stan Sieler's fix to my adaption of snprintf fix by Stan Sieler :-)
 
 * Revision 2.34  2013-02-27 16:57:25+01  fred
 * Added snprintf fix by Stan Sieler