au1000: Remove unmaintained target

This target only supports kernel 3.18, which is not supported in OpenWrt
any more for multiple releases. It also looks like there is no active
maintainer for this target.
Remove the code and all the packages which are only used by this target.

To add this target to OpenWrt again port it to a recent and supported
kernel version.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

package/boot/yamonenv/Makefile

@@ -1,41 +0,0 @@
-#
-# Copyright (C) 2006 OpenWrt.org
-#
-# This is free software, licensed under the GNU General Public License v2.
-# See /LICENSE for more information.
-#
-
-include $(TOPDIR)/rules.mk
-
-PKG_NAME:=yamonenv
-PKG_VERSION:=20051022
-PKG_RELEASE:=1
-
-PKG_SOURCE:=$(PKG_NAME)_gruen.4g__$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL:=https://downloads.openwrt.org/sources
-PKG_HASH:=466eca9cdad2c15e957fb9ce7d0b6927ecd17d85c4cc2dff37e97a3e6b209c67
-
-PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)
-
-PKG_FLAGS:=nonshared
-
-include $(INCLUDE_DIR)/package.mk
-
-define Package/yamonenv
-  SECTION:=utils
-  CATEGORY:=Utilities
-  SUBMENU:=Boot Loaders
-  DEPENDS:=@TARGET_au1000
-  TITLE:=YAMON configuration utility
-  MAINTAINER:=Florian Fainelli <florian@openwrt.org>
-endef
-
-define Build/Configure
-endef
-
-define Package/yamonenv/install
-	$(INSTALL_DIR) $(1)/usr/sbin
-	$(CP) $(PKG_BUILD_DIR)/src/$(PKG_NAME) $(1)/usr/sbin/
-endef
-
-$(eval $(call BuildPackage,yamonenv))

package/boot/yamonenv/patches/001-yamonenv_mtd_partition.patch

@@ -1,11 +0,0 @@
---- a/src/yamonenv.c
-+++ b/src/yamonenv.c
-@@ -12,7 +12,7 @@
- #include <fcntl.h>
- #include <unistd.h>
- 
--#define DEFAULT_YAMON_ENV_FILE   "/dev/mtd/3"
-+#define DEFAULT_YAMON_ENV_FILE   "/dev/mtd3"
- 
- 
- // control byte definitions: