add update target to toolchain/
add update target to toolchain/

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7754 3c298f89-4303-0410-b956-a3cf2f4a3e73

--- a/toolchain/Makefile
+++ b/toolchain/Makefile
@@ -50,7 +50,7 @@
 $(TOOLCHAIN_BUILD_DIR):
 	@mkdir -p $@
 
-%-prereq %-download %-clean %-refresh: FORCE
+%-prereq %-download %-clean %-refresh %-update: FORCE
 	$(MAKE) -C $* $(patsubst $*-%,%,$@)
 
 %-prepare: $(STAGING_DIR)/$(REAL_GNU_TARGET_NAME) $(TOOLCHAIN_BUILD_DIR)	

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