[libclc] [libclc] Create LIBCLC_OUTPUT_LIBRARY_DIR directory before build (PR #158171)

[Wenju He via cfe-commits]

wenju-he wrote:

> Seems like a cmake bug

Thanks for the review.
AI search show this is expected behavior "Unix Makefiles" generator.
```
The Ninja generator takes a more explicit and proactive approach to ensuring output directories exist, aligning with its focus on robust and efficient parallel builds. The "Unix Makefiles" generator, in contrast, relies more on the implicit directory creation capabilities of the underlying make commands and the build environment.
```

https://github.com/llvm/llvm-project/pull/158171