Tag Lua 5.4.4

Fixes:
- To-be-closed variables in "for" loops are not avoiding tail calls.
- C99 comments ("//") are not compatible with C89.
- Yielding in a __close metamethod called when returning vararg results mess up
    the returned values.
- Function-statement syntax does not check whether name is a constant.
- 'luaL_tolstring' may get confused with negative indices.
- Negation in macro 'luaV_shiftr' may overflow.
- 'coroutine.resume' does not increment counter of C calls when continuing
    execution after a protected error.
- Wrong status in coroutine while closing variables during reset.
- Lua stack still active when closing a state.
- Finalizers should not be able to invoke the GC.
- Finalizers can be called with an invalid stack.
- Finalizer calling os.exit can corrupt finalization order.

See https://www.lua.org/bugs.html#5.4.3 for more detailed information.