Bug#773385: Ping

[Dima Kogan <dkogan@debian.org>]

This really should work. It's maybe sorta ok for "apt-file list", but it
also affects "apt-file find". Look:

  dima@fatty:~$ apt-file find /usr/lib/aarch64-linux-gnu/libOpenCL.so


  dima@fatty:~$ apt-file -aarm64 find /usr/lib/aarch64-linux-gnu/libOpenCL.so

  nvidia-libopencl1: /usr/lib/aarch64-linux-gnu/libOpenCL.so.1
  nvidia-libopencl1: /usr/lib/aarch64-linux-gnu/libOpenCL.so.1.0.0
  ocl-icd-libopencl1: /usr/lib/aarch64-linux-gnu/libOpenCL.so.1
  ocl-icd-libopencl1: /usr/lib/aarch64-linux-gnu/libOpenCL.so.1.0.0
  ocl-icd-opencl-dev: /usr/lib/aarch64-linux-gnu/libOpenCL.so

I.e. I asked it to tell me what package provides a file, and I had to
tell it which architecture to look at.

The whole point of apt-file is to look up the package name from a path,
and if I have to tell IT things like the architecture, it loses a lot of
its utility.

Thanks.