bug#15484: 24.3.50; link error: xdisp.c uses windowing functions for terminal only case

[Jan Djärv]

Hello.

face_for_font is called at xdisp.c:6972, leading to an unlinkable Emacs when 
configured for terminal only:

Undefined symbols for architecture x86_64:
  "_face_for_font", referenced from:
      _get_next_display_element in xdisp.o
ld: symbol(s) not found for architecture x86_64

        Jan D.