CXX11 patch to warn if 'override' is missing on overriding virtual function

[jahanian]

Hi all,

We have an enhancement request  from our users to provide 
warning if ‘override’ control is missing. This warning is off by default as it will
be noisy (but it will show itself with -Weverything). 
Is such a patch useful enough to go into the trunk? Also, comment on the patch is appreciated.
I will provide ‘fixit’ later if this is a worthwhile patch.

- Fariborz

	
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