Updated patch for pciutils

[Joan Lledó]

Hello Hurd,

I updated the pciutils patch I wrote in 2017. The new version is attached.

This is the same patch with minor changes:
- Makefile updated to be applied on newer sources.
- hurd_detect(): Use stat() instead of lstat() to work with symbolic links.
- enum_devices(): Call closedir() on error when reading the PCI filesystem.

To avoid misunderstandings, this patch is for upstream at:

https://github.com/pciutils/pciutils

and my intention is to send them a PR if you think the patch is OK.