Copied STAILQ_HEAD_INITIALIZER and LIST_HEAD_INITIALIZER from NetBSD, and added STAILQ_REMOVE_HEAD_QUEUE to emulate NetBSD's SIMPLEQ_REMOVE_HEAD (that removes not only the first element but a queue of elements).
Copied STAILQ_HEAD_INITIALIZER and LIST_HEAD_INITIALIZER from NetBSD, and
added STAILQ_REMOVE_HEAD_QUEUE to emulate NetBSD's SIMPLEQ_REMOVE_HEAD (that
removes not only the first element but a queue of elements).

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase