[Buildroot] Added packages: libmsgpack (v. 0.5.7) and msgpack-python (0.1.10)

[Wojciech M. Zabolotny]

I had to add two packages msgpack-python and libmsgpack to my embedded
system running Linux compiled with buildroot-2011.11
Unfortunately this version of buildroot does not support setuptools,
so I couldn't use the msgpack-python v. 0.2.0, and had to use older v.
 0.1.10.
As my buildroot is compiled without C++ support, I had also to disable
the C++ API in libmsgpack.