further clean up OS differences in makefiles

No need for if() logic.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

net/Makefile

@@ -1,34 +1,24 @@
 DIR=	${LIBEXECDIR}/net
-SRCS=	ifconfig.sh.in
+SRCS=	ifconfig.sh.in ${SRCS-${OS}}
 INC=	dhclient.sh dhcpcd.sh ifconfig.sh macchanger.sh macnet.sh \
-	ssidnet.sh system.sh wpa_supplicant.sh
+	ssidnet.sh system.sh wpa_supplicant.sh ${INC-${OS}}
 
 MK=	../mk
 include ${MK}/os.mk
 
-ifeq (${OS},FreeBSD)
-SRCS+=		iwconfig.sh.in
-INC+=		iwconfig.sh
+SRCS-FreeBSD=	iwconfig.sh.in
+INC-FreeBSD=	iwconfig.sh
 
-.SUFFIXES:	.sh.BSD.in
-.sh.BSD.in.sh:
-	${CP} $< $@
-else ifeq (${OS},Linux)
-SRCS+=		iwconfig.sh.in
-INC+=		adsl.sh apipa.sh arping.sh bonding.sh br2684ctl.sh bridge.sh \
+SRCS-Linux=	iwconfig.sh.in
+INC-Linux=	adsl.sh apipa.sh arping.sh bonding.sh br2684ctl.sh bridge.sh \
 		ccwgroup.sh clip.sh ethtool.sh iproute2.sh ifplugd.sh ip6to4.sh \
 		ipppd.sh iwconfig.sh netplugd.sh pppd.sh pump.sh tuntap.sh udhcpc.sh \
 		vlan.sh
 
-.SUFFIXES:	.sh.Linux.in
-.sh.Linux.in.sh:
-	${CP} $< $@
-else ifeq (${OS},NetBSD)
-INC+=		ifwatchd.sh
+SRCS-NetBSD=
+INC-NetBSD=	ifwatchd.sh
 
-.SUFFIXES:	.sh.BSD.in
-.sh.BSD.in.sh:
+${SFX}.sh:
 	${CP} $< $@
-endif
 
 include ${MK}/scripts.mk