Implement the old mmap syscall for compat32, when COMPAT_43 option is enabled. The syscall is used by FreeBSD 1.1.5.1 dynamic linker.
Implement the old mmap syscall for compat32, when COMPAT_43 option is
enabled. The syscall is used by FreeBSD 1.1.5.1 dynamic linker.

MFC after:	1 week

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