Arm64 support is added for luaffi library

[奥斯陆君王 <qtiuto@...>]

To run ffi for lua 5.3 in Android, I add arm64 support for the luaffi
library, and fix its arm support. Anyone interested in it can open my
project page:https://github.com/qtiuto/lua-for-android/tree/master/luaffi.
The project is cloned from the ravi ffi library
https://github.com/dibyendumajumdar/ravi-ffi.
I add lua5.3 integer support for it also.
The dynasm tool is changed  to add data storage for arm and arm64.
The project is build by Android NDK, but I think it's easily built by
other build system referring to the raviffi library.
Some Android features are added to it when built by NDK.
 For more information, see
https://github.com/qtiuto/lua-for-android/wiki/LUA-FFI.