Revert "build: align SOURCE path for build system and SDK"

This reverts commit 131e41614d.
Sadly it makes menuconfig fail with
tmp/.config-package.in:171: glob failed: No files found "feeds/base/utils/busybox/Config.in"
make: *** [/usr/src/openwrt/include/toplevel.mk:136: menuconfig] Error 1

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

include/package-defaults.mk

@@ -20,7 +20,7 @@ define Package/Default
   PROVIDES:=
   EXTRA_DEPENDS:=
   MAINTAINER:=$(PKG_MAINTAINER)
-  SOURCE:=$(patsubst $(TOPDIR)/%,%,$(patsubst $(TOPDIR)/package/%,feeds/base/%,$(CURDIR)))
+  SOURCE:=$(patsubst $(TOPDIR)/%,%,$(CURDIR))
   ifneq ($(PKG_VERSION),)
     ifneq ($(PKG_RELEASE),)
       VERSION:=$(PKG_VERSION)-$(PKG_RELEASE)

target/imagebuilder/files/Makefile

@@ -106,8 +106,7 @@ PROFILE_LIST = $(foreach p,$(PROFILE_NAMES), \
 	@$(SCRIPT_DIR)/target-metadata.pl profile_mk $< '$(BOARD)$(if $(SUBTARGET),/$(SUBTARGET))' > $@
 
 staging_dir/host/.prereq-build: include/prereq-build.mk
-	mkdir -p tmp feeds
-	ln -sf $(TOPDIR)/package $(TOPDIR)/feeds/base
+	mkdir -p tmp
 	@$(_SINGLE)$(NO_TRACE_MAKE) -j1 -r -s -f $(TOPDIR)/include/prereq-build.mk prereq IB=1 2>/dev/null || { \
 		echo "Prerequisite check failed. Use FORCE=1 to override."; \
 		false; \