Add a check for <unistd.h> providing a prototype for getopt() which is compatible

with the one in	include/getopt.h.  If so then define HAVE_DECL_GETOPT.

binutils/addr2line.c

@@ -29,6 +29,7 @@
    both forms write results to stdout, the second form reads addresses
    to be converted from stdin.  */
 
+#include "config.h"
 #include <string.h>
 
 #include "bfd.h"