LWG Issue 2087: iostream_category() and noexcept

[Marshall Clow]

http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2087

Mark the following calls as _NOEXCEPT:
	error_code make_error_code(io_errc e) _NOEXCEPT ;
	error_condition make_error_condition(io_errc e)  _NOEXCEPT ;
	const error_category& iostream_category() _NOEXCEPT ;

Since adding no except is a conforming extension to the standard, do it unconditionally; not just for C++14.
Also, add a missing set of "()" in the synopsis; this is purely cosmetic - no code change there.

-- 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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