[llvm-branch-commits] [libc++abi] Stop copying headers to the build directory (PR #115086)

[Alexander Richardson via llvm-branch-commits]

arichardson wrote:

> Can't we do the same for libc++ as well?

Looks like CI is happy on this one so I'll try the same with libc++ next.

https://github.com/llvm/llvm-project/pull/115086