cpg.h, coroapi.h: more size_t and const changes

• include/corosync/cpg.h (cpg_deliver_fn_t, cpg_confchg_fn_t)

(cpg_groups_get_fn_t):

• include/corosync/engine/coroapi.h (ipc_response_send)

(ipc_dispatch_send, tpg_join, tpg_leave, tpg_groups_mcast)
(tpg_groups_reserve):

git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@2043 fd59a12c-fef9-0310-b244-a6a79926bd2f