5910 libnisdb won't build with modern GCC

@@ -18,16 +18,15 @@
  * information: Portions Copyright [yyyy] [name of copyright owner]
  *
  * CDDL HEADER END
  */
 /*
+ * Copyright 2015 Gary Mills
  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma ident   "%Z%%M% %I%     %E% SMI"
-
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include <ctype.h>
 #include <fcntl.h>

@@ -59,10 +58,11 @@
 void *s_malloc(size_t size);
 __nis_mapping_format_t *dup_format_mapping(
         __nis_mapping_format_t *in);
 bool_t dup_mapping_element(__nis_mapping_element_t *in,
         __nis_mapping_element_t *out);
+bool_t is_string_ok(char *, int);
 
 extern FILE *cons;
 
 /*
  * FUNCTION:    free_parse_structs