Deprecate the rest of the rune interface.

lib/libc/locale/frune.c

@@ -45,6 +45,7 @@ __FBSDID("$FreeBSD$");
 #include <stddef.h>
 #include <stdio.h>
 
+__warn_references(fgetrune, "warning: fgetrune() is deprecated. See fgetrune(3).");
 long
 fgetrune(fp)
 	FILE *fp;
@@ -72,6 +73,7 @@ fgetrune(fp)
 	return (_INVALID_RUNE);
 }
 
+__warn_references(fungetrune, "warning: fungetrune() is deprecated. See fungetrune(3).");
 int
 fungetrune(r, fp)
 	rune_t r;
@@ -87,6 +89,7 @@ fungetrune(r, fp)
 	return (0);
 }
 
+__warn_references(fputrune, "warning: fputrune() is deprecated. See fputrune(3).");
 int
 fputrune(r, fp)
 	rune_t r;

lib/libc/locale/rune.3

@@ -69,6 +69,25 @@
 .Ft int
 .Fn fputrune "rune_t rune" "FILE *stream"
 .Sh DESCRIPTION
+.Bf Em
+The
+.Bx 4.4
+.Dq rune
+functions have been deprecated in favour of the
+.Tn ISO
+C99 extended multibyte and wide character facilities
+and should not be used in new applications.
+.Ef
+Consider using
+.Xr setlocale 3 ,
+.Xr mbrtowc 3 ,
+.Xr wcrtomb 3 ,
+.Xr fgetwc 3 ,
+.Xr ungetwc 3 ,
+and
+.Xr fputwc 3
+instead.
+.Pp
 The
 .Fn setrunelocale
 controls the type of encoding used to represent runes as multibyte strings