[compiler-rt] [compiler-rt] Use installed libc++(abi) for tests instead of build tree (PR #115077)

[Björn Pettersson via llvm-commits]

bjope wrote:

> But I guess the goal was to use a path to the just installed version here (from the DESTDIR)?

Or should the isystem paths setup by compiler-rt/lib/fuzzer/CMakeLists.txt use `...build/include/c++/v1` now?


https://github.com/llvm/llvm-project/pull/115077