[libcxx-commits] [libcxx] [libcxx] [modules] Fix relative paths with absolute LIBCXX_INSTALL_MODULES_DIR (PR #85756)

[Martin Storsjö via libcxx-commits]

mstorsjo wrote:

I pushed a fix in d209d1340b99d4fbd325dffb5e13b757ab8264ea now.

Let's update the backport PR with this as well:
/cherry-pick 272d1b44efdedb68c194970a610f0ca1b7b769c5 d209d1340b99d4fbd325dffb5e13b757ab8264ea

https://github.com/llvm/llvm-project/pull/85756