Do not include sys/filio.h

* configure.ac (AC_CHECK_HEADERS): Remove sys/filio.h.
* term.c: Do not include <sys/filio.h>.
diff --git a/configure.ac b/configure.ac
index bb8bf46..40cdc0c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -270,7 +270,6 @@
 	sys/conf.h
 	sys/epoll.h
 	sys/fanotify.h
-	sys/filio.h
 	sys/ioctl.h
 	sys/poll.h
 	sys/reg.h
diff --git a/term.c b/term.c
index b2811f2..8dfc9aa 100644
--- a/term.c
+++ b/term.c
@@ -31,9 +31,6 @@
  * the kernel one, and we need to use the kernel layout.
  */
 #include <linux/termios.h>
-#ifdef HAVE_SYS_FILIO_H
-# include <sys/filio.h>
-#endif
 
 #include "xlat/tcxonc_options.h"