LWG Issue 2056 - change the value of future_errc::broken_promise

[Marshall Clow]

Make it non-zero, like all the other error codes in the library.

Note: This changes both the dylib and the headers, and in a way that could break existing code
(i.e, if you explicitly test for std:: future_errc::broken_promise, then you will need to recompile your code)

-- 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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