libx86-1: add the recipe

A library to provide support for making real-mode calls x86 calls. On
x86 hardware, vm86 mode is used. On other platforms, x86 emulation is
provided.

Signed-off-by: Roy Li <rongqing.li@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>