Use libdplibs
 Fix a bug that the specification revision of the Power Management function
was incorrectly printed in the output of capability "list".
The value is also printed in the detail output and it has no bug.
- Cleanup pci_conf_print_caplist. Use table. The reason why it loops twice
  is that some capabilities appear multiple times (e.g. HyperTransport cap).
- Print the specification revision of Power Management and AGP not in
  the capability list part but in the detail part.
 Add some HyperTransport related defines. It's required for the MSI.
Add vis() function, and canonicalise file names via vis(unvis($1)).

XXX: The vis() function is very limited, due to the absence of ord()
in NetBSD's awk.