Introduce prototype-style definition for __libc_fatal.  Upstream, this
was done as part of:

commit a600e5cef53e10147932d910cdb2fdfc62afae4e
Author: Roland McGrath <roland@hack.frob.com>
Date:   Tue Mar 19 17:07:15 2013 -0700

    Consolidate Linux and POSIX libc_fatal code.

diff --git a/sysdeps/unix/sysv/linux/libc_fatal.c b/sysdeps/unix/sysv/linux/libc_fatal.c
index 6cc96d76e98fe191..90dd6265152824e5 100644
--- a/sysdeps/unix/sysv/linux/libc_fatal.c
+++ b/sysdeps/unix/sysv/linux/libc_fatal.c
@@ -199,8 +199,7 @@ __libc_message (int do_abort, const char *fmt, ...)
 
 
 void
-__libc_fatal (message)
-     const char *message;
+__libc_fatal (const char *message)
 {
   /* The loop is added only to keep gcc happy.  */
   while (1)