Add script to manually build.
Add script to manually build.

Follow instructions at http://luajit.org/install.html
to setup windows build environment and then run build.bat

luvit/luvi,joerg-krause/luvi,luvit/luvi,virgo-agent-toolkit/luvi,brimworks/luvi,kidaa/luvi,zhaozg/luvi,virgo-agent-toolkit/luvi,joerg-krause/luvi,zhaozg/luvi,brimworks/luvi