[llvm] [libc++][CI] Fixes documentation builder. (PR #78327)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-github-workflow

Author: Mark de Wever (mordante)

<details>
<summary>Changes</summary>

The documentation CI no longer builds. This is likely introduced by
8f90e6937a1fac80873bb2dab5f382c82ba1ba4e. This fixes the issue.


---
Full diff: https://github.com/llvm/llvm-project/pull/78327.diff


1 Files Affected:

- (modified) .github/workflows/docs.yml (+1-1) 


``````````diff
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index bf559964ff97b80..5936cdc46a902d5 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -138,7 +138,7 @@ jobs:
       - name: Build libcxx docs
         if: steps.docs-changed-subprojects.outputs.libcxx_any_changed == 'true'
         run: |
-          cmake -B libcxx-build -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_RUNTIMES="libcxxabi;libcxx" -DLLVM_ENABLE_SPHINX=ON ./runtimes
+          cmake -B libcxx-build -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_RUNTIMES="libcxxabi;libcxx;libunwind" -DLLVM_ENABLE_SPHINX=ON ./runtimes
           TZ=UTC ninja -C libcxx-build docs-libcxx-html
       - name: Build libc docs
         if: steps.docs-changed-subprojects.outputs.libc_any_changed == 'true'

``````````

</details>


https://github.com/llvm/llvm-project/pull/78327