[libc] [llvm] [libc] Add maintainers file (PR #133471)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-aarch64-sve2-vla` running on `linaro-g4-01` while building `libc,llvm` at step 7 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/198/builds/3246

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 7 (ninja check 1) failure: stage 1 checked (failure)
...
PASS: Flang :: Driver/mlir-pass-pipeline.f90 (24735 of 96419)
PASS: Flang :: Driver/print-effective-triple.f90 (24736 of 96419)
PASS: Flang :: Driver/print-resource-dir.F90 (24737 of 96419)
PASS: Flang :: Driver/phases.f90 (24738 of 96419)
PASS: Flang :: Driver/lto-bc.f90 (24739 of 96419)
PASS: Flang :: Driver/print-pipeline-passes.f90 (24740 of 96419)
PASS: Flang :: Driver/parse-fir-error.ll (24741 of 96419)
PASS: Clangd Unit Tests :: ./ClangdTests/8/81 (24742 of 96419)
PASS: Flang :: Driver/predefined-macros-compiler-version.F90 (24743 of 96419)
UNRESOLVED: Flang :: Driver/slp-vectorize.ll (24744 of 96419)
******************** TEST 'Flang :: Driver/slp-vectorize.ll' FAILED ********************
Test has no 'RUN:' line
********************
PASS: Flang :: Driver/override-triple.ll (24745 of 96419)
PASS: Flang :: Driver/print-target-triple.f90 (24746 of 96419)
PASS: Flang :: Driver/parse-ir-error.f95 (24747 of 96419)
PASS: Flang :: Driver/fsave-optimization-record.f90 (24748 of 96419)
PASS: Flang :: Driver/pass-plugin-not-found.f90 (24749 of 96419)
PASS: Flang :: Driver/pp-fixed-form.f90 (24750 of 96419)
PASS: Flang :: Driver/multiple-input-files.f90 (24751 of 96419)
PASS: Flang :: Driver/pthread.f90 (24752 of 96419)
PASS: Flang :: Driver/std2018-wrong.f90 (24753 of 96419)
PASS: Flang :: Driver/scanning-error.f95 (24754 of 96419)
PASS: Clangd Unit Tests :: ./ClangdTests/76/81 (24755 of 96419)
PASS: Flang :: Driver/supported-suffices/f08-suffix.f08 (24756 of 96419)
PASS: Flang :: Driver/input-from-stdin/input-from-stdin.f90 (24757 of 96419)
PASS: Flang :: Driver/q-unused-arguments.f90 (24758 of 96419)
PASS: Flang :: Driver/mllvm.f90 (24759 of 96419)
PASS: Flang :: Driver/supported-suffices/f03-suffix.f03 (24760 of 96419)
PASS: Flang :: Driver/optimization-remark-invalid.f90 (24761 of 96419)
PASS: Flang :: Driver/target-gpu-features.f90 (24762 of 96419)
PASS: Flang :: Driver/tco-code-gen-llvm.fir (24763 of 96419)
PASS: Flang :: Driver/target.f90 (24764 of 96419)
PASS: Flang :: Driver/lto-flags.f90 (24765 of 96419)
PASS: Flang :: Driver/optimization-remark-backend.f90 (24766 of 96419)
PASS: Clangd Unit Tests :: ./ClangdTests/9/81 (24767 of 96419)
PASS: Clangd Unit Tests :: ./ClangdTests/72/81 (24768 of 96419)
PASS: Flang :: Driver/prescanner-diag.f90 (24769 of 96419)
PASS: Flang :: Driver/unparse-with-modules.f90 (24770 of 96419)
PASS: Flang :: Driver/no-duplicate-main.f90 (24771 of 96419)
PASS: Flang :: Driver/unsupported-vscale-max-min.f90 (24772 of 96419)
PASS: Flang :: Driver/fveclib.f90 (24773 of 96419)
PASS: Flang :: Driver/save-temps.f90 (24774 of 96419)
PASS: Flang :: Driver/target-machine-error.f90 (24775 of 96419)
PASS: Flang :: Driver/werror-wrong.f90 (24776 of 96419)
PASS: Flang :: Driver/std2018.f90 (24777 of 96419)
PASS: Flang :: Driver/response-file.f90 (24778 of 96419)
PASS: Flang :: Driver/falias-analysis.f90 (24779 of 96419)
PASS: Flang :: Driver/unparse-use-analyzed.f95 (24780 of 96419)

```

</details>

https://github.com/llvm/llvm-project/pull/133471