MF22: removed duplicate #include of <sys.cdefs.h> and fixed comments about the main #include of it.
MF22: removed duplicate #include of <sys.cdefs.h> and fixed comments about
the main #include of it.

Fixed disordering of _BSD_CLOCKID_T.

Removed forward declarations of "common" structs.  The declarations are
now made closer to where they are used.

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