font handling which did not support "*xp-listfonts-modes:
xp-list-internal-printer-fonts" or "*xp-listfonts-modes:
xp-list-glyph-fonts" to toggle the usage of printer-builtin and glyph
fonts in XListFonts*(), XLoad*Font(), etc. Additionally the Xprint DDX
now explicitly list "xp-listfonts-modes" in
"document-attributes-supported" (for document-level) or
"xp-page-attributes-supported" (for page-level) when the DDX implements
this feature (as described in the CDE DtPrint specification).