build(zig): run oldtests in zig builds with new lua runner

The new lua based runner replaces Makefile, runnvim.sh and runnvim.vim

As it happens, we run a `--headless` nvim inside a `:terminal` layer,
this is pointless.
Also there is still a lot remnants for oldesttests, but we don't
have any except for test1.in which just checks the environment
for following, nonexistant oldesttests. so just skip that.

For now, the actual vimscript code which runs in vim-under-test is
completely unchanged.

On macos, luajit is finally working with the latest ziglua master.
Also fix some minor bugs regarding locales, such as incorrect
HAVE_WORKING_LIBINTL checks

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