New config feature - time1 can declare GPS wraparound compensation

[Fred Wright]

On Fri, 16 Aug 2019, Eric S. Raymond via devel wrote:
> Sanjeev Gupta <ghane0 at gmail.com>:
>>
>> sizeof(double) seems to be 8 bytes.  The 8192 * No of Secs per week
>> overflows this.
>
> Huh. If "long double" isn't 16 bytes, we're foing to have a problem.

There's no guarantee that long double differs from double.  Anything that 
depends on it to do so is nonportable.

That can't be the issue here, anyway, since overflow couldn't have 
happened after converting to floating-point.

Fred Wright