Patch for LWG issue #2145

[Marshall Clow]

http://cplusplus.github.io/LWG/lwg-defects.html#2145

Mark the constructor for std::error_category as inline and constexpr.
Leave the (existing, out-of-line, non-constexpr) in the dylib for compatibility with existing programs)
No tests, because I don't know how to test it (given that error_category is both an abstract class and has a user-defined destructor)

-- 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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