Add missing #include

Bump WARNS level to 2

PR:		bin/71668
Submitted by:	Dan Lukes <dan@obluda.cz>
MFC after:	3 days

usr.sbin/bluetooth/hcsecd/Makefile

@@ -4,7 +4,7 @@
 PROG=		hcsecd
 MAN=		hcsecd.8 hcsecd.conf.5
 SRCS=		hcsecd.c lexer.l parser.y
-WARNS?=		1
+WARNS?=		2
 CFLAGS+=	-I${.CURDIR}
 
 DPADD=		${LIBBLUETOOTH}

usr.sbin/bluetooth/hcsecd/parser.y

@@ -39,6 +39,7 @@
 #include <stdarg.h>
 #include <string.h>
 #include <syslog.h>
+#include <unistd.h>
 #include "hcsecd.h"
 
 	int	yyparse  (void);