tracetool: Include osdep.h in generated-ust.c

When generating the trace/generated-ust.c source file, make sure
it includes osdep.h as its first include.

This fixes compilation with --enable-trace-backends=ust

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1456240661-15422-1-git-send-email-peter.maydell@linaro.org
Reviewed-by: Eric Blake <eblake@redhat.com>

scripts/tracetool/format/ust_events_c.py

@@ -21,6 +21,8 @@ def generate(events, backend):
               if "disabled" not in e.properties]
 
     out('/* This file is autogenerated by tracetool, do not edit. */',
+        '',
+        '#include "qemu/osdep.h"',
         '',
         '#define TRACEPOINT_DEFINE',
         '#define TRACEPOINT_CREATE_PROBES',