doc: update MUSDK library build instructions
doc: update MUSDK library build instructions

By default both static and shared libraries should be created while
building MUSDK library. It turns out that this will not happen if
host parameter is not explicitly passed to the configure script.

Specifying host makes sure configure will detect support for shared
libraries.

Signed-off-by: Tomasz Duszynski <389c907effde06d7d3e3fb2cf2ccfaf9dc5af62a@semihalf.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk