[cff] Use `name' table for PS name if we have a SFNT-CFF. This follows the OpenType 1.7 specification. See http://tug.org/pipermail/tex-live/2015-April/036634.html for a discussion. * src/cff/cffdrivr.c (cff_get_ps_name): Use the `sfnt' service if we have an SFNT.