gallium/aux: Update scons build for u_tracepoints.[ch]

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
Part-of: <!7974>
86 jobs for !7974 with wip/utrace in 15 minutes and 43 seconds (queued for 5 seconds)
merge request