hwdata package

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

We seem to have grown two `hwdata' packages from
https://github.com/vcrhonek/hwdata/ in the last month:

- sysutils/hwdata
- misc/hwdata

The differences are:

- sysutils/hwdata uses buildlink3 while misc/hwdata does not; I think
  it should use buildlink3 so downstream packages can get a limited
  view of it exposed through buildlink3 (may require
  BUILDLINK_FILES.hwdata+= share/* to work properly, not sure).

- sysutils/hwdata puts hwdata.pc in share/pkgconfig as upstream does
  by default, while misc/hwdata changes this to go in lib/pkgconfig.
  Not sure what the right thing is here but there seems to be lots of
  precedent for share/pkgconfig/*.pc in other packages.

- sysutils/hwdata disables installing
  lib/modprobe.d/dist-blacklist.conf, while misc/hwdata installs it;
  not sure what the right thing is here.

- sysutils/hwdata patches the Makefile to avoid a syntax error (not
  sure what it is?), while misc/hwdata patches the Makefile to use
  $(SED), $(BSD_INSTALL_*), and a custom PKGCONFIG_DIR.

I don't have strong feelings about these, but maybe we should have
just one hwdata package -- can I trouble you two, bsiegert and vins,
to decide how to merge them?