duplicated sanity check warning

[Martin Buchholz]

This is a bug report.

I was trying to build openjdk6, and make sanity got duplicated
BUILD_JDK = true
lines in the output.

Looking at control/make/make/sanity-rules.gmk, I see duplicate lines

ifeq ($(JDK_SRC_AVAILABLE), true)
	@$(ECHO) "   BUILD_JDK    = $(BUILD_JDK) " >> $(MESSAGE_FILE)
endif
ifeq ($(JDK_SRC_AVAILABLE), true)
	@$(ECHO) "   BUILD_JDK    = $(BUILD_JDK) " >> $(MESSAGE_FILE)
endif

Delete one of the above.

Martin