[clang-tools-extra] [clangd] support the zig c++ compiler wrapper (PR #100759)

[Duncan Ogilvie via cfe-commits]

mrexodia wrote:

Worked around this by creating a wrapper script `zig-c++`: https://github.com/mrexodia/zig-cross/commit/56b384c96675660554a5d87fe5e5a95bf0bfbe7a

https://github.com/llvm/llvm-project/pull/100759