Improve the smilint target in the hostres and mibII modules

- Mark the smilint target .PHONY so it's always executed when requested
- Leverage .PATH for BMIBS instead of spelling the path out longhand
  for them

MFC after:	1 week

usr.sbin/bsnmpd/modules/snmp_hostres/Makefile

@@ -76,6 +76,7 @@ LIBADD=	kvm devinfo m geom memstat
 printcap.pico: printcap.c
 	${CC} ${PICFLAG} -DPIC ${CFLAGS:C/^-W.*//} -c ${.IMPSRC} -o ${.TARGET}
 
-smilint:
+smilint: .PHONY
+smilint: ${BMIBS}
 	env SMIPATH=.:/usr/share/snmp/mibs:/usr/local/share/snmp/mibs \
-	    smilint -c /dev/null -l6 -i group-membership BEGEMOT-HOSTRES-MIB
+	    smilint -c /dev/null -l6 -i group-membership ${.ALLSRC}

usr.sbin/bsnmpd/modules/snmp_mibII/Makefile

@@ -22,6 +22,7 @@ BMIBS=	BEGEMOT-IP-MIB.txt BEGEMOT-MIB2-MIB.txt
 
 .include <bsd.snmpmod.mk>
 
-smilint:
+smilint: .PHONY
+smilint: ${BMIBS}
 	env SMIPATH=/usr/share/snmp/mibs:/usr/local/share/snmp/mibs \
-	    smilint -c /dev/null -l6 -i group-membership ${BMIBS:C/^/${CONTRIB}\/snmp_mibII\//}
+	    smilint -c /dev/null -l6 -i group-membership ${.ALLSRC}