[Patch/RFC] libstdc++/16154 (aka: requirements of input iterators)

[Paolo Carlini]

Hi,

this PR is about an over strict concept check. I think submitter is
right in believing that: "Neither in section 24.1.1 nor in section 25.2
of the C++ standard I see any requirement that input iterators have to
be default constructible"

Therefore, I propose the below minimal fix. Longer term, we may consider,
for many other reasons, upgrading to the latest Boost release.

Ok with everyone? I'll wait 'til this evening...

Paolo.

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