tools: add autoconf-archive

Some autotools based build systems are using autoconf-archive scripts
and are expecting them to almost always be available. This is not
required for regular releases as tar balls generated for releases
commonly have existing configure script. This is rather intended to be
used with autotools.mk's autoreconf and in cases it is not always
possible to get release tar ball.

Including this adds little to no overhead in terms of build time as
those are just m4 scripts copied to an appropriate location.

Signed-off-by: Karel Kočí <karel.koci@nic.cz>
[fixed From: to match SoB]
Signed-off-by: Petr Štetiar <ynezz@true.cz>

tools/Makefile

@@ -22,7 +22,7 @@ ifneq ($(CONFIG_SDK)$(CONFIG_PACKAGE_kmod-b43)$(CONFIG_PACKAGE_b43legacy-firmwar
 endif
 
 tools-$(BUILD_TOOLCHAIN) += gmp mpfr mpc libelf expat
-tools-y += m4 libtool autoconf automake flex bison pkgconf mklibs zlib
+tools-y += m4 libtool autoconf autoconf-archive automake flex bison pkgconf mklibs zlib
 tools-y += sstrip make-ext4fs e2fsprogs mtd-utils mkimage
 tools-y += firmware-utils patch-image quilt padjffs2
 tools-y += mm-macros missing-macros cmake bc findutils gengetopt patchelf

tools/autoconf-archive/Makefile

@@ -0,0 +1,28 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=autoconf-archive
+PKG_VERSION:=2019.01.06
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
+PKG_SOURCE_URL:=@GNU/autoconf-archive
+PKG_HASH:=17195c833098da79de5778ee90948f4c5d90ed1a0cf8391b4ab348e2ec511e3f
+
+include $(INCLUDE_DIR)/host-build.mk
+
+HOST_CONFIGURE_ARGS += \
+	--datarootdir=$(STAGING_DIR_HOST)/share
+
+define Host/Compile
+	export SHELL="$(BASH)"; $(MAKE) -C $(HOST_BUILD_DIR)
+endef
+
+define Host/Install
+	export SHELL="$(BASH)"; $(MAKE) -C $(HOST_BUILD_DIR) install
+endef
+
+define Host/Clean
+	-export SHELL="$(BASH)"; $(MAKE) -C $(HOST_BUILD_DIR) uninstall
+	$(call Host/Clean/Default)
+endef
+
+$(eval $(call HostBuild))