[libc-commits] [libc] [libc] fix -Wmissing-braces (PR #77345)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

Strangely, I haven't been able to reproduce the build bots failures when trying to cross compile a fullbuild. My cmake:

```
$ cmake ../runtimes -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_C_COMPILER=clang -G Ninja -DLLVM_ENABLE_LLD=ON -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_RUNTIMES="libc" -DLLVM_LIBC_FULL_BUILD=ON -DLIBC_HDRGEN_EXE=$HDRGEN -DLIBC_TARGET_TRIPLE=aarch64-linux-gnu
```

https://github.com/llvm/llvm-project/pull/77345