add 'make prepare' target for building the tools and toolchain

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@8780 3c298f89-4303-0410-b956-a3cf2f4a3e73

Makefile

@@ -50,10 +50,13 @@ dirclean: clean
 # check prerequisites before starting to build
 prereq: $(package/stamp-prereq) $(target/stamp-prereq) ;
 
-world: .config $(tools/stamp-install) $(toolchain/stamp-install) $(target/stamp-compile) $(package/stamp-cleanup) $(package/stamp-compile) $(package/stamp-install) $(package/stamp-rootfs-prepare) $(target/stamp-install) FORCE
+prepare: .config $(tools/stamp-install) $(toolchain/stamp-install)
+world: prepare $(target/stamp-compile) $(package/stamp-cleanup) $(package/stamp-compile) $(package/stamp-install) $(package/stamp-rootfs-prepare) $(target/stamp-install) FORCE
 	$(MAKE) package/index
 
 package/symlinks:
 	$(SCRIPT_DIR)/feeds.sh $(CONFIG_SOURCE_FEEDS) $(CONFIG_SOURCE_FEEDS_REV)	
 
+.PHONY: clean dirclean prereq prepare world package/symlinks
+
 endif