[libc-commits] [libc] [libc] fix typo due to futex renaming (PR #91379)

[Michael Jones via libc-commits]

https://github.com/michaelrj-google approved this pull request.

The way our cmake is set up, if a target is missing a dependency it will just skip that target (and anything that depends on it). You can get warnings for this with `-DLIBC_CMAKE_VERBOSE_LOGGING=ON`.

https://github.com/llvm/llvm-project/pull/91379