list: #include <stddef.h> in qblist.h (#384)
list: #include <stddef.h> in qblist.h (#384)

Some platforms require it.
kgaillot/libqb,kgaillot/libqb,ClusterLabs/libqb,ClusterLabs/libqb,kgaillot/libqb,ClusterLabs/libqb