Disable overrides during jdk build

[Chris Hegarty]

Please hold your fire! This is not a suggestion to about general 
handling of warnings during the build, just a specific gripe I have when 
trying to find genuine build failures among the noise.

Would there be any objection to adding '-overrides' to the jdk build?

This lint warning was added after the new build was introduced. I 
suspect it would have been suppressed originally if it was supported at 
the time.

diff --git a/makefiles/Setup.gmk b/makefiles/Setup.gmk
--- a/makefiles/Setup.gmk
+++ b/makefiles/Setup.gmk
@@ -23,7 +23,7 @@
  # questions.
  #

-DISABLE_WARNINGS:=-Xlint:all,-deprecation,-unchecked,-rawtypes,-cast,-serial,-dep-ann,-static,-fallthrough,-try,-varargs,-empty,-finally
+DISABLE_WARNINGS:=-Xlint:all,-deprecation,-unchecked,-rawtypes,-cast,-serial,-dep-ann,-static,-fallthrough,-try,-varargs,-empty,-finally,-overrides

  # The generate old bytecode javac setup uses the new compiler to 
compile for the
  # boot jdk to generate tools that need to be run with the boot jdk.

-Chris.

P.S. how to handle warnings generally will have to be addressed at some 
point, but I am not making any proposal at this time.