Add osv Makefile target

Added an "osv" make target that builds a shred object lua.so and luac.so
for use inside an OSv image.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Add OSv Capstanfile

Added OSv Capstanfile to build an OSv image with lua

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>