LuaJIT PPC64el pre-release

This is the final release for porting activities of PowerPC 64 Little Endian. From now on only backports from official LuaJIT releases is expected to be released if it's not merged into main LuaJIT repository.

First LuaJIT ppc64el

First LuaJIT ppc64el release based on LuaJIT v2.1 branch