Release 2.0.5 (the last stable release of LuaJIT) is extremely old by now and contains some known serious bugs. Unfortunately, the primary developer has stated many times (for example) that he doesn't intend to make new tagged releases, and the way forward is using the HEAD of v2.1 branch.
CMake script of Minetest recently started complaining about outdated LuaJIT and recommending to switch to git, so I propose to move our LuaJIT to 2.1 branch and sync it from time to time.

1. Rebuilt minetest 5.7.0 against this version.
2. Tested Lua script execution in Minetest and mpv (both use Lua quite heavily).