* xterm.c (x_list_fonts): If maxnames is less than 0, get all font

* xterm.c (x_list_fonts): If maxnames is less than 0, get all font
names.

* xfaces.c (x_face_list_fonts): Allocate struct font_name here.
(sorted_font_list): Moved allocation of struct font_name to
x_face_list_fonts.
(Fx_font_family_list): Set font-list-limit to -1 to get all font names.
(Fx_list_fonts): Set maxnames to -1 to get all font names.