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

sh/Makefile

@@ -8,7 +8,33 @@ INSTALLAFTER=	_installafter
 
 MK=	../mk
 include ${MK}/os.mk
-include Makefile.${OS}
+
+ifeq ($(OS),FreeBSD)
+SRCS+=		init.sh.in
+
+.SUFFIXES:	.sh.BSD.in
+.sh.BSD.in.sh:
+	${SED} ${SED_REPLACE} ${SED_EXTRA} $< > $@
+
+else ifeq ($(OS),Linux)
+SRCS+=		init.sh.in init-early.sh.in udhcpc-hook.sh.in
+BIN+=		init-early.sh udhcpc-hook.sh
+
+.SUFFIXES:	.sh.Linux.in
+.sh.Linux.in.sh:
+	${SED} ${SED_REPLACE} ${SED_EXTRA} $< > $@
+
+else ifeq ($(OS),NetBSD)
+SRCS+=		init.sh.in
+
+SRCS+=		ifwatchd-carrier.sh.in ifwatchd-nocarrier.sh.in
+BIN+=		ifwatchd-carrier.sh ifwatchd-nocarrier.sh
+
+.SUFFIXES:	.sh.BSD.in
+.sh.BSD.in.sh:
+	${SED} ${SED_REPLACE} ${SED_EXTRA} $< > $@
+endif
+
 include ${MK}/scripts.mk
 
 _installafter: