[COMMITTED] De-warning a few stubs.

--- a/io/openat.c
+++ b/io/openat.c
@@ -22,6 +22,7 @@ 
 #include <stdio.h>
 #include <sys/stat.h>
 #include <kernel-features.h>
+#include <libc-internal.h>
 
 /* Some mostly-generic code (e.g. sysdeps/posix/getcwd.c) uses this variable
    if __ASSUME_ATFCTS is not defined.  */
@@ -33,10 +34,7 @@  int __have_atfcts;
    the directory associated with FD.  If OFLAG includes O_CREAT, a
    third argument is the file protection.  */
 int
-__openat (fd, file, oflag)
-     int fd;
-     const char *file;
-     int oflag;
+__openat (int fd, const char *file, int oflag, ...)
 {
   int mode;
 
@@ -66,6 +64,8 @@  __openat (fd, file, oflag)
       va_start (arg, oflag);
       mode = va_arg (arg, int);
       va_end (arg);
+
+      ignore_value (mode);
     }
 
   __set_errno (ENOSYS);
--- a/io/openat64.c
+++ b/io/openat64.c
@@ -21,15 +21,13 @@ 
 #include <stddef.h>
 #include <stdio.h>
 #include <sys/stat.h>
+#include <libc-internal.h>
 
 /* Open FILE with access OFLAG.  Interpret relative paths relative to
    the directory associated with FD.  If OFLAG includes O_CREAT, a
    third argument is the file protection.  */
 int
-__openat64 (fd, file, oflag)
-     int fd;
-     const char *file;
-     int oflag;
+__openat64 (int fd, const char *file, int oflag, ...)
 {
   int mode;
 
@@ -59,6 +57,8 @@  __openat64 (fd, file, oflag)
       va_start (arg, oflag);
       mode = va_arg (arg, int);
       va_end (arg);
+
+      ignore_value (mode);
     }
 
   __set_errno (ENOSYS);
--- a/misc/ptrace.c
+++ b/misc/ptrace.c
@@ -19,6 +19,7 @@ 
 #include <sys/ptrace.h>
 #include <sys/types.h>
 #include <stdarg.h>
+#include <libc-internal.h>
 
 /* Perform process tracing functions.  REQUEST is one of the values
    in <sys/ptrace.h>, and determines the action to be taken.
@@ -30,8 +31,7 @@ 
      pid_t PID, void *ADDR, int DATA, void *ADDR2
    after PID.  */
 int
-ptrace (request)
-     enum __ptrace_request request;
+ptrace (enum __ptrace_request request, ...)
 {
   pid_t pid;
   void *addr;
@@ -60,32 +60,41 @@  ptrace (request)
     case PTRACE_SETFPREGS:
     case PTRACE_GETFPAREGS:
     case PTRACE_SETFPAREGS:
-      va_start(ap, request);
-      pid = va_arg(ap, pid_t);
-      addr = va_arg(ap, void *);
-      va_end(ap);
+      va_start (ap, request);
+      pid = va_arg (ap, pid_t);
+      addr = va_arg (ap, void *);
+      va_end (ap);
+      ignore_value (pid);
+      ignore_value (addr);
       break;
 
     case PTRACE_POKETEXT:
     case PTRACE_POKEDATA:
     case PTRACE_POKEUSER:
-      va_start(ap, request);
-      pid = va_arg(ap, pid_t);
-      addr = va_arg(ap, void *);
-      data = va_arg(ap, int);
-      va_end(ap);
+      va_start (ap, request);
+      pid = va_arg (ap, pid_t);
+      addr = va_arg (ap, void *);
+      data = va_arg (ap, int);
+      va_end (ap);
+      ignore_value (pid);
+      ignore_value (addr);
+      ignore_value (data);
       break;
 
     case PTRACE_READDATA:
     case PTRACE_WRITEDATA:
     case PTRACE_READTEXT:
     case PTRACE_WRITETEXT:
-      va_start(ap, request);
-      pid = va_arg(ap, pid_t);
-      addr = va_arg(ap, void *);
-      data = va_arg(ap, int);
-      addr2 = va_arg(ap, void *);
-      va_end(ap);
+      va_start (ap, request);
+      pid = va_arg (ap, pid_t);
+      addr = va_arg (ap, void *);
+      data = va_arg (ap, int);
+      addr2 = va_arg (ap, void *);
+      va_end (ap);
+      ignore_value (pid);
+      ignore_value (addr);
+      ignore_value (data);
+      ignore_value (addr2);
       break;
 
     default:
@@ -97,5 +106,4 @@  ptrace (request)
   return -1;
 }
 
-
 stub_warning (ptrace)
--- a/misc/reboot.c
+++ b/misc/reboot.c
@@ -18,15 +18,16 @@ 
 #include <errno.h>
 #include <unistd.h>
 #include <sys/reboot.h>
+#include <libc-internal.h>
 
 /* Reboot the system.  */
 int
-reboot (howto)
-     int howto;
+reboot (int howto)
 {
+  ignore_value (howto);
+
   __set_errno (ENOSYS);
   return -1;
 }
 
-
 stub_warning (reboot)