The installation of Google Protocol Buffers python header files
requires the ability to run the "protoc" compiler on the host to
generate the Python header files.  This fix adds a native package
that builds Google Protocol Buffers for the host machine to provide
the compiler that is used to cross-compile the package for the target
machine.

Signed-off-by: Keith Holman <Keith.Holman@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>