Remove old-style function definitions.

We already require -std=gnu99 and old-style function definitions might
hide some compiler warnings.

Signed-off-by: Mark Wielaard <mjw@redhat.com>
diff --git a/libelf/elf_end.c b/libelf/elf_end.c
index d4ae051..7ea876c 100644
--- a/libelf/elf_end.c
+++ b/libelf/elf_end.c
@@ -1,5 +1,5 @@
 /* Free resources associated with Elf descriptor.
-   Copyright (C) 1998,1999,2000,2001,2002,2004,2005,2007 Red Hat, Inc.
+   Copyright (C) 1998,1999,2000,2001,2002,2004,2005,2007,2015 Red Hat, Inc.
    This file is part of elfutils.
    Written by Ulrich Drepper <drepper@redhat.com>, 1998.
 
@@ -40,8 +40,7 @@
 
 
 int
-elf_end (elf)
-     Elf *elf;
+elf_end (Elf *elf)
 {
   Elf *parent;