[patch] : Fix operator+ in random_access_iterator_wrapper

[carlinip@tiscali.it]

Hi Chris,

> This small patch fixes operator+ in random_access_iterator_wrapper, a class
only used in the libstdc++-v3 testsuite.

and thanks for your two patches: I will take care of both by the end of this
week, as soon as I'm back home.

Paolo.

P.S. After all, waiting a bit before merging the testsuite changes to mainline
was a good idea... ;)


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