Missed a case of _POSIX_MAC_PRESENT -> _PC_MAC_PRESENT rename.
Missed a case of _POSIX_MAC_PRESENT -> _PC_MAC_PRESENT rename.

Pointed out by:	phk

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