[compiler-rt] [scudo] Change tests that use setrlimit to cause mmap to fail. (PR #87004)

[Evgenii Stepanov via llvm-commits]

eugenis wrote:

LGTM.
You could've just used getrlimit() to check - it would've shown the original (non-zero) limits on qemu. But this works, too.

https://github.com/llvm/llvm-project/pull/87004