Replace <strings.h> with <string.h>. No functions from the former are

used in this file, and strlen() needs to be prototyped by the latter,
for this to compile without warnings.

Reviewed by:	mike

bin/dd/misc.c

@@ -49,7 +49,7 @@ static const char rcsid[] =
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <strings.h>
+#include <string.h>
 #include <unistd.h>
 
 #include "dd.h"