librbd: include missing header for bool type

[trociny]

Signed-off-by: Mykola Golub mgolub@mirantis.com

[trociny]

@dillaman I had this error when building with lttng:

  CC       tracing/librbd_tp_la-librbd.lo
In file included from tracing/librbd.h:14:0,
                 from tracing/librbd.c:6:
./include/rbd/librbd.h:165:62: error: unknown type name 'bool'
 CEPH_RBD_API int rbd_mirror_is_enabled(rados_ioctx_t io_ctx, bool *enabled);
                                                              ^
./include/rbd/librbd.h:166:63: error: unknown type name 'bool'
 CEPH_RBD_API int rbd_mirror_set_enabled(rados_ioctx_t io_ctx, bool enabled);

[loic-bot]

FAILURE: http://jenkins.ceph.dachary.org/job/ceph/9839/

• FAILURE http://jenkins.ceph.dachary.org/job/ceph/LABELS=centos-7&&x86_64/9839/