whoever includes tracing/librbd.h should depends on librbd-tp.
this fix the FTBFS of:
ceph/src/librbd/librbd.cc:50:10: fatal error: tracing/librbd.h: No such
file or directory
#include "tracing/librbd.h"
^~~~~~~~~~~~~~~~~~
compilation terminated.
src/librbd/CMakeFiles/rbd_api.dir/build.make:62: recipe for target
'src/librbd/CMakeFiles/rbd_api.dir/librbd.cc.o' failed