chrono libcxx msvcrt patch slight revision

[Howard Hinnant]

On Sep 21, 2013, at 4:08 PM, G M <gmisocpp at gmail.com> wrote:

> Slight revision to prior chrono patch: Added _LIBCPP_NORETURN.
> (Note dependant upon #warning patch presented previously).
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Question for those interested in libc++ on Windows:

I generally prefer my errors to come at compile time, or at least link time, rather than run time.  This patch delays until runtime the fact that the chrono clocks are not implemented.  Is that really what the Windows porters want?  If so, I'll commit this patch.  I just wanted to ask first, as it is not what I did for Apple platforms.

Howard