Patch for LWG issue 2275 - forward_as_tuple should be constexpr

[Marshall Clow]

This is an easy one; we already had a "__forward_as_tuple" that was constexpr that did the same thing as "forward_as_tuple"
Remove the __ one, make sure that the remaining one is constexpr, and add a test to be sure.

-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists at gmail.com>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait).
        -- Yu Suzuki

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