systat(1) reaches WARNS=6 on i386 and amd64. This is good

for catching general regressions in future.  Unfortunately,
it still displays some problems at WARNS=6 on architectures
with stricter alignment requirements, e.g., ia64.

usr.bin/systat/Makefile

@@ -9,6 +9,10 @@ SRCS=	cmds.c cmdtab.c devs.c fetch.c iostat.c keyboard.c main.c \
 	mode.c ip.c tcp.c \
 	vmstat.c convtbl.c ifcmds.c ifstat.c
 
+.if ${MACHINE_ARCH} == "i386" || ${MACHINE_ARCH} == "amd64"
+WARNS?=	6
+.endif
+
 .if ${MK_INET6_SUPPORT} != "no"
 SRCS+=	icmp6.c ip6.c
 CFLAGS+= -DINET6