* dispextern.h (struct face): Use bitfields for 'underline_type'

* dispextern.h (struct face): Use bitfields for 'underline_type'
and 'box' members.  Remove set-but-unused members 'pixmap_w' and
'pixmap_h'.  If not HAVE_WINDOW_SYSTEM, also remove dummy
'stipple' member.  Move 'lface' member up to help...
* xfaces.c (make_realized_face): ...this function to find and
clear just the members that need clearing.
(load_face_colors, realize_x_face):
* xdisp.c (extend_face_to_end_of_line): Adjust user.