Introduce prototype-style function definition for bzero.  This happened

upstream as part of:

commit ddcf6798d35beca3c4eec80ea448b57fd45558f4

Author: Wilco Dijkstra <wdijkstr@arm.com>

Date:   Fri Feb 27 14:41:46 2015 +0000

    Rather than using a C implementation of memset, directly call memset, which

    typically has a much faster optimized implementation.

diff --git a/string/bzero.c b/string/bzero.c

index b7a88ec9253bdf0c..c3276e7752935801 100644

--- a/string/bzero.c

+++ b/string/bzero.c

@@ -23,9 +23,7 @@

 /* Set N bytes of S to 0.  */

 void

-__bzero (s, len)

-     void *s;

-     size_t len;

+__bzero (void *s, size_t len)

 {

   long int dstp = (long int) s;

   const op_t zero = 0;