ctdb: add PACKAGECONFIG for libtdb

Fixed:
WARNING: QA Issue: ctdb rdepends on libtdb, but it isn't a build dependency? [build-deps]

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>