cc-wrapper: add libcxxabi include flag for LLVM

Removed workaround from llvm 16.

Fixes including cxxabi.h on llvm >=15 libcxxStdenv.

```c
int main() {}
```

```
/nix/store/qwnvng0cbyx0bijm654jpmpl0516hfhx-libcxxabi-15.0.7-dev/include/cxxabi.h:20:10: fatal error: '__cxxabi_config.h' file not found
```

Before llvm 15 this used to work because `libcxx` copied the headers
from `cxxabi` to it's own `include`, which was then picked up by the
line above this one

Alternative fix would be to copy all files from `${cxxabi.dev}/include/c++/v1` to `${cxxabi.dev}/include` so the cc-wrapper setup hook would pick them up, but that would depend on in cxxabi being in buildInputs.

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

0 files changed, 0 insertions, 0 deletions