Add LOG_WARN alias

Along with syslogp(), this is ia killer vendor lock-in feature.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/syslog.h

@@ -63,6 +63,7 @@
 #define	LOG_ALERT	1	/* action must be taken immediately */
 #define	LOG_CRIT	2	/* critical conditions */
 #define	LOG_ERR		3	/* error conditions */
+#define	LOG_WARN	4	/* warning conditions, alias */
 #define	LOG_WARNING	4	/* warning conditions */
 #define	LOG_NOTICE	5	/* normal but significant condition */
 #define	LOG_INFO	6	/* informational */