[libc-commits] [libc] [libc] Add missing casts in StrtolTest (PR #119054)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

err libc/cmake/modules/LLVMLibCCompileOptionRules.cmakeL237 sets -Wconversion, but it's commented out! Let me do some git archaeology to better understand why.

https://github.com/llvm/llvm-project/pull/119054