[PATCH v4] Ensure mktime sets errno on error (bug 23789)

[Paul Eggert]

Paul Eggert wrote:
> 3. Please construct a third patch containing your mktime test case for glibc, 
> and we then apply that patch to glibc.

I looked at that test case and found some issues with it, e.g., it assumed a 
particular time_t width in some cases and assumed a particular error number in 
others. Attached is a revised test case that should fix the issues. For 
convenience I'm also attaching the same glibc code patch again.
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