Fixes name issue for luajit-2.1.
Fixes name issue for luajit-2.1.

ignacio/lua-rapidjson,ignacio/lua-rapidjson,tvbeat/lua-rapidjson,tvbeat/lua-rapidjson,ignacio/lua-rapidjson,ignacio/lua-rapidjson,xpol/lua-rapidjson,xpol/lua-rapidjson