xen{trace/analyze}: don't use 64bit versions of libc functions

xen{trace/analyze}: don't use 64bit versions of libc functions

This is not needed, neither encouraged. Configure already checks
_FILE_OFFSET_BITS and appends it when needed, so that the right functions
are used. Also remove the usage of loff_t and O_LARGEFILE for the same
reason.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: Olaf Hering <olaf@aepfle.de>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: George Dunlap <george.dunlap@eu.citrix.com>