Add forgotten SYSCALL_MODULE_HELPER() for msgsys() syscall.
Add forgotten SYSCALL_MODULE_HELPER() for msgsys() syscall.

Discovered by: Valentin Chopov <valentin@valcho.net>

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