Clang related fixes:

* When calling syslog(), pass a format string.
* Define YY_NO_INPUT on nslexer.l

Submitted by:	Norberto Lopes <nlopes.ml at gmail.com>

lib/libc/net/nslexer.l

@@ -53,6 +53,7 @@ static char *rcsid =
 
 #include "nsparser.h"
 
+#define	YY_NO_INPUT
 #define YY_NO_UNPUT
 
 %}

lib/libc/sys/stack_protector.c

@@ -92,7 +92,7 @@ __fail(const char *msg)
 	(void)sigprocmask(SIG_BLOCK, &mask, NULL);
 
 	/* This may fail on a chroot jail... */
-	syslog(LOG_CRIT, msg);
+	syslog(LOG_CRIT, "%s", msg);
 
 	(void)memset(&sa, 0, sizeof(sa));
 	(void)sigemptyset(&sa.sa_mask);