This is the preliminary version of lspci text output support (the location

This is the preliminary version of lspci text output support (the location
of pci.ids is hard-coded to /usr/share/misc/pci.ids, as found on Debian/Ubuntu).
+88 lines in two files, including reformatting, comments, whitespace,
and build configuration as well as new code.

The changes:
-Add library code to look up descriptions.
-Add a counter for -n (for the sake of -nn)
-Add the file stream "db" to GLOBALS and open it conditionally
-Add name fields to bufs
-Look up text if enabled and -n is passed never or twice
-Print text if lookup succeeded