luajit: revert to 2.1 on aarch64 for now

https://nix-cache.s3.amazonaws.com/log/irncmyl5d6h21jzg5rm10q8s2sxqirmv-luajit-2.0.5.drv
It's hard to debug for me, without an aarch64 machine.

Changed files
+2 -1
pkgs
development
interpreters
luajit
+2 -1
pkgs/development/interpreters/luajit/default.nix
···
luajit =
# Compatibility problems with lightuserdata pointers; see:
# https://github.com/LuaJIT/LuaJIT/blob/v2.1/doc/status.html#L101
-
if hostPlatform.is64bit && (hostPlatform.isArm || hostPlatform.isSunOS)
+
if hostPlatform.is64bit && (/*hostPlatform.isArm ||*/ hostPlatform.isSunOS)
+
# FIXME: fix the aarch64 build
then luajit_2_0
else luajit_2_1;