[llvm] [libc][bazel] fix fenv tests after refactor (PR #89839)

[Pranav Kant via llvm-commits]

pranavk wrote:

Oops. I am sorry. I didn't know about this PR and pushed a fix for Bazel breakage to main already (https://github.com/llvm/llvm-project/commit/688c10d23630a23e7bb63804de117d1f281c4961)

https://github.com/llvm/llvm-project/pull/89839