Add build system

Add autoconf style build infrastructure to the ZFS tree.  This
includes autogen.sh, configure.ac, m4 macros, some scripts/*,
and makefiles for all the core ZFS components.

Makefile.am

@@ -0,0 +1,56 @@
+include $(top_srcdir)/config/rpm.am
+include ${top_srcdir}/config/deb.am
+include ${top_srcdir}/config/tgz.am
+
+if CONFIG_USER
+USER_DIR = config etc man scripts lib cmd
+endif
+if CONFIG_KERNEL
+KERNEL_DIR = module
+endif
+SUBDIRS = $(USER_DIR) $(KERNEL_DIR)
+
+AUTOMAKE_OPTIONS = foreign dist-zip
+EXTRA_DIST  = autogen.sh zfs.spec.in zfs-modules.spec.in
+EXTRA_DIST += config/config.awk config/rpm.am config/deb.am config/tgz.am
+EXTRA_DIST += META DISCLAIMER COPYRIGHT GIT README.markdown
+EXTRA_DIST += OPENSOLARIS.LICENSE ZFS.RELEASE
+
+noinst_HEADERS = zfs_config.h
+
+distclean-local::
+	-$(RM) -R autom4te*.cache
+	-find . \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
+		-o -name .pc -o -name .hg -o -name .git \) -prune -o \
+		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
+		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
+		-o -name '.*.rej' -o -name 'aclocal.m4' -o -size 0 \
+		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \
+		-o -name 'Makefile' -o -name 'Module.symvers' \
+		-o -name '*.order' -o -name '*.markers' \
+		-o -name '.script-config' \) \
+		-type f -print | xargs $(RM)
+
+if CONFIG_KERNEL
+install-data-local:
+	destname=zfs-$(ZFS_META_VERSION)/$(LINUX_VERSION); \
+	instdest=$(DESTDIR)/usr/src/$$destname; \
+	echo "${ZFS_META_VERSION}" >$$instdest/zfs.release; \
+	for instfile in $(noinst_HEADERS) module/$(LINUX_SYMBOLS); do \
+		$(INSTALL) -D $$instfile $$instdest/$$instfile; \
+	done
+endif
+
+ctags:
+	$(RM) $(top_srcdir)/tags
+	find $(top_srcdir) -name .git -prune -o -name '*.[hc]' | xargs ctags
+
+etags:
+	$(RM) $(top_srcdir)/TAGS
+	find $(top_srcdir) -name .pc -prune -o -name '*.[hc]' | xargs etags -a
+
+tags: ctags etags
+
+pkg: @DEFAULT_PACKAGE@
+pkg-modules: @DEFAULT_PACKAGE@-modules
+pkg-utils: @DEFAULT_PACKAGE@-utils