[libcxx] [libcxx][NFC] Added `libunwind` to `LLVM_ENABLE_RUNTIMES` for Windows… (PR #162682)

[Martin Storsjö via libcxx-commits]

mstorsjo wrote:

> I tried running the original command, but the error told me I had to include libunwind.

That's interesting - can you quote the exact error? I did test this build configuration back when writing the docs, but apparently something has changed somewhere. (It may be some libcxx/libcxxabi internal defaults that have changed.)

Including libunwind clearly is a more complete build setup, how it possibly is built in most cases, but for the original example, I tried to do a setup that was as minimal as possible. But including libunwind should probably make it more robust and be a closer match to what we actually test.

https://github.com/llvm/llvm-project/pull/162682