busybox: Remove the remains of busybox usr move hack

patches/openwrt/hack/0001-busybox-Try-to-install-everything-into-s-bin.patch

-From 709c24eb908ceb268c9dcb1b8665716c33d3dbef Mon Sep 17 00:00:00 2001
-From: Michal Hrusecky <Michal@Hrusecky.net>
-Date: Tue, 27 Feb 2018 17:24:33 +0100
-Subject: [PATCH] busybox: Try to install everything into /{s,}bin
-
-Signed-off-by: Michal Hrusecky <Michal@Hrusecky.net>
----
- package/utils/busybox/Makefile | 7 +++++++
- 1 file changed, 7 insertions(+)
-
-diff --git a/package/utils/busybox/Makefile b/package/utils/busybox/Makefile
-index fc882d3..5d4ba1d 100644
---- a/package/utils/busybox/Makefile
-+++ b/package/utils/busybox/Makefile
-@@ -132,6 +132,8 @@ endef
- define Package/busybox/install
- 	$(INSTALL_DIR) $(1)/etc/init.d
- 	$(CP) $(PKG_INSTALL_DIR)/* $(1)/
-+	ln -s ../../bin/busybox $(1)/usr/bin/env
-+	rm -f $(1)/sbin/ifup $(1)/sbin/ifdown
- ifneq ($(CONFIG_BUSYBOX_$(BUSYBOX_SYM)_CROND),)
- 	$(INSTALL_BIN) ./files/cron $(1)/etc/init.d/cron
- endif
--- 
-2.16.2
-