Low: ipc_socket: Allow socket max msg size to be calculated more accurately
Low: ipc_socket: Allow socket max msg size to be calculated more accurately

kgaillot/libqb,ClusterLabs/libqb,rubenk/libqb,ClusterLabs/libqb,kgaillot/libqb,ClusterLabs/libqb,rubenk/libqb,gao-yan/libqb,kgaillot/libqb,davidvossel/libqb,davidvossel/libqb,gao-yan/libqb