[libc-commits] [libc] [libc][search] implement posix `lfind` function (PR #114692)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

Unable to repro the buildbots failure locally...
```
$ cmake ../llvm -GNinja -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_BUILD_TYPE=Debug "-DLLVM_ENABLE_PROJECTS=llvm;libc;clang;compiler-rt" -DLLVM_LIBC_INCLUDE_SCUDO=ON -DLIBC_INCLUDE_BENCHMARKS=ON -DLLVM_LIBC_FULL_BUILD=ON
$ ninja libc
<builds fine>
$
```

https://github.com/llvm/llvm-project/pull/114692