relax requirements for vector==

[Gabriel Dos Reis]

Benjamin Kosnik <bkoz@redhat.com> writes:

| Instead of relaxing requirements, perhaps a more sane thing to do is
| to make the concept checking code a flag you have to turn on (at
| configure time?), and not something that is forced on everybody's code.

I would rather we turn off the concept checking as currently done.

-- Gaby
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