Unbreak for the !__XSI_VISIBLE case when another header that defines size_t has not been included first.
Unbreak for the !__XSI_VISIBLE case when another header that defines
size_t has not been included first.

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