(best_matching_font): Remove unused parameter PATTERN.

(best_matching_font): Remove unused parameter PATTERN.
(first_font_matching): Removed unused function.
(x_face_list_fonts): Remove unused parameter SCALABLE_P.
(may_use_scalable_font_p): Remove parameter FONT; rename
parameter NAME to FONT.
(x_face_list_fonts): Fix missing bounds check.
(realizing_default_face_p): New variable.
(realize_default_face): Set and clear that flag.
(x_face_list_fonts): When called during the realization of the
default face, and no matching fonts are found when ignoring
scalable fonts and fonts matching a regexp from
face-ignored-fonts, try without ignoring fonts.