LWG Issue 2143: ios_base::xalloc should be thread-safe

[Marshall Clow]

http://cplusplus.github.io/LWG/lwg-defects.html#2143

The only thing it does is increment a static member variable and return the previous value.
Change the static member variable to be atomic.

-- 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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