support.
* New function makeFontsConf to generate a fontconfig configuration
file. Moved from NixOS.
* dot2pdf: use makeFontsConf to generate a fonts.conf containing just
the Ghostscript fonts (see NIXPKGS-29).
* dot2pdf: generate PDF directly, don't go through PS. Note that this
and using fontconfig changes the interpretation of "fontname"
attributes in dot graphs.
svn path=/nixpkgs/trunk/; revision=12251
