luajit: bump new version

* ci: add nojit flavor for exotic builds
* test: fix lua-Harness JIT-related tests
* test: adjust JIT-related tests in tarantool-tests
* build: fix build with JIT disabled
* Minor fixes.

NO_DOC=LuaJIT submodule bump
NO_TEST=LuaJIT submodule bump
NO_CHANGELOG=test