Add a private header file for libc/libc_r/libpthread to contain definitions for things like locking etc.
Add a private header file for libc/libc_r/libpthread to contain
definitions for things like locking etc.

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