[clang-tools-extra] clangd: Add a build option to disable building dexp (PR #133124)

[Yoann Congal via cfe-commits]

ycongal-smile wrote:

I received 2 failing builds:
- LLVM Buildbot: builder sanitizer-x86_64-linux-bootstrap-asan build 7561
  - https://lab.llvm.org/buildbot/#/builders/52/builds/7561
- LLVM Buildbot: builder sanitizer-x86_64-linux-fast build 10441
  - https://lab.llvm.org/buildbot/#/builders/169/builds/10441

I've looked at the logs. IMHO it is an unrelated error : my change change if a single tool is built, the error is a single test related to address sanitation failing.

https://github.com/llvm/llvm-project/pull/133124