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
Forgot to check in xfdopen(). My bad.

Failure of fdopen() is most likely failure of malloc() for the FILE structure.
Achille Fouilleul pointed out that fdlength wasn't returning the right length in the binary search case.

(This code was originally written for mke2fs, and applies to block devices. The regular file case should just return the length from stat. The ioctl is left commented out in case I want to add back code to check the size of CDROMs without spinning them up again; not sure the sector size is always right these days.)