Arch Linux ldc package can't use asan

[Atila Neves]

I don't know who's the current maintainer of the Arch Linux D 
packages. ldc1.7.0 from the Arch repositories doesn't work with 
-fsanitize=address right now, it fails to link. I originally 
filed an ldc bug here:

https://github.com/ldc-developers/ldc/issues/2488

But it turns out that the pre-built version from dlang.org works 
fine, so I opened an Arch bug here:

https://bugs.archlinux.org/task/57026

Atila