lib/kadm5: do not prototype imported _krb5_put_int

The function _krb5_put_int() is a private function exported from
lib/krb5.  Its declaration should come from krb5-private.h.  A local
declaration will not result in the proper import qualifiers on
Windows.

Change-Id: I53e7aeea9f2f34cab105f2e331f3c6522847ccfe

lib/kadm5/get_s.c

@@ -31,6 +31,7 @@
  * SUCH DAMAGE.
  */
 
+#include <krb5_locl.h>
 #include "kadm5_locl.h"
 #include <assert.h>
 
@@ -62,9 +63,6 @@ add_tl_data(kadm5_principal_ent_t ent, int16_t type,
     return 0;
 }
 
-KRB5_LIB_FUNCTION krb5_ssize_t KRB5_LIB_CALL
-_krb5_put_int(void *buffer, unsigned long value, size_t size); /* XXX */
-
 static
 krb5_error_code
 copy_keyset_to_kadm5(kadm5_server_context *context, krb5_kvno kvno,