RSB package: Google Protocol Buffers

[Chris Johns]

Hi,

I have added Google Protocol Buffers 
(https://developers.google.com/protocol-buffers/) as a 3rd party package 
to RTEMS. Testing and feedback welcome.

To use:

  $ cd rtems-source-builder/rtems
  $ ../source-builder/sb-set-builder \
        --prefix=/opt/rtems/4.11 --with-tools=/opt/rtems/4.11 \
        --host=sparc-rtems4.11 --with-rtems-bsp=sis \
        4.11/net/protobuf

Chris