[llvm] [llvm-lit] Resolve env subcommand required error (PR #98414)

[Paul Kirth via llvm-commits]

ilovepi wrote:

@jh7370 I think we have some other tests that have an `EMPTY` suffix, such as https://github.com/llvm/llvm-project/blob/9ba524427321b931bad156860755adf420aeec6a/llvm/utils/lit/tests/Inputs/shtest-env/env-calls-env.txt#L6

I suppose we should update those too(separately).

https://github.com/llvm/llvm-project/pull/98414