ports/133146: [patch] x11-fonts/dejavu: install fontconfig configuration files to conf.avail and optionally links to conf.d

[Anonymous]

(CC'ing fontconfig maintainer, the PR slowly goes into oblivion)

I'd like to point out that pkgsrc's dejavu package installs
configuration files, too. It installs them into EXAMPLESDIR, though.

Besides, there are a number of ports that install into
fonts/conf.{avail|d}, e.g.

  japanese/font-ipa
  japanese/font-ipa-uigothic
  japanese/font-ipaex
  japanese/font-kochi
  japanese/font-mona-ipa
  japanese/font-mplus
  japanese/font-mplus-ipa
  japanese/font-sazanami
  japanese/font-takao
  japanese/font-ume
  japanese/font-vlgothic
  x11-fonts/indic-ttf
  x11-fonts/wqy

but they don't have an option *not* to install into etc/fonts/conf.d.