Avoid some unnecessary stdio.h includes

Avoid some unnecessary stdio.h includes

* src/atimer.c, src/callproc.c, src/coding.c, src/dired.c, src/eval.c:
* src/fringe.c, src/ftcrfont.c, src/ftfont.c, src/ftxfont.c:
* src/gfilenotify.c, src/indent.c, src/kqueue.c, src/menu.c:
* src/scroll.c, src/terminal.c, src/unexcoff.c, src/window.c:
* src/xfont.c, src/xftfont.c:
Do not include stdio.h since it is unused.