consolodate Makefiles

The tree contained many operating system specific Makefiles which were
being included in other Makefiles. This commit removes those and adds
the code to the makefiles which included them using make's conditional
processing.

X-Gentoo-Bug: 387441
X-Gentoo-Bug-URL: http://bugs.gentoo.org/show_bug.cgi?id=387441

etc/Makefile

@@ -5,7 +5,21 @@ CLEANFILES+=	rc.conf
 
 MK=	../mk
 include ${MK}/os.mk
-include Makefile.${OS}
+
+ifeq ($(OS),FreeBSD)
+SED_EXTRA=	-e 's:@TERM@:cons25:g'
+SRCS+=		rc.conf.in rc.in rc.shutdown.in
+CONF+=		devd.conf
+BIN+=		rc rc.shutdown rc.devd
+else ifeq ($(OS),Linux)
+SED_EXTRA=	-e 's:@TERM@:wsvt25:g'
+SRCS+=		rc.conf.in rc.in rc.shutdown.in
+else ifeq ($(OS),NetBSD)
+SED_EXTRA=	-e 's:@TERM@:wsvt25:g'
+SRCS+=		rc.conf.in rc.in rc.shutdown.in
+BIN+=		rc rc.shutdown
+endif
+
 include ${MK}/scripts.mk
 
 # We can't use "ifndef" here because that treats set-but-empty

etc/Makefile.FreeBSD

@@ -1,4 +0,0 @@
-SED_EXTRA=	-e 's:@TERM@:cons25:g'
-SRCS+=		rc.conf.in rc.in rc.shutdown.in
-CONF+=		devd.conf
-BIN+=		rc rc.shutdown rc.devd

etc/Makefile.Linux

@@ -1,2 +0,0 @@
-SED_EXTRA=	-e 's:@TERM@:wsvt25:g'
-SRCS+=		rc.conf.in rc.in rc.shutdown.in

etc/Makefile.NetBSD

@@ -1,3 +0,0 @@
-SED_EXTRA=	-e 's:@TERM@:wsvt25:g'
-SRCS+=		rc.conf.in rc.in rc.shutdown.in
-BIN+=		rc rc.shutdown