pciutils: bump to version 3.1.8 and other fixes

Bump to pciutils version 3.1.8
Also make it build after busybox because it's got a lightweight
lspci whereas the full-blown is preferred.
Ditch the pci.ids skeleton comment since it's been shipped for some time
now.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>