Hello,

DXL has a number of language specific functions which I think would be
better to fontify like builtins, similar to what is done in AWK.

On the other hand DXL is more typed than AWK, so the 3 level
fontification of cc-fonts.el is better to use than do a specific
fontification like in AWK mode.

In order to achieve this goal of reusing cc-fonts, I propose the
addition of a new lang constant c-builtin-kwds. This allows the
dxl-mode.el which I am elaborating to plug more readily on EMACS CC
progmode.

If nobody objects I would commit the change the patch thereof is herein
attached.

VBR,
  Vincent.