[tz] strftime %s

[Clive D.W. Feather]

Paul Eggert via tz said:
> The only types guaranteed to be free of padding
> bits are signed char, unsigned char,

char,

> and (if they exist) the intN_t and
> uintN_t types. In the C standard the intN_t and uintN_t types are optional;
> POSIX requires them only for N equal to 8, 16, and 32.

C requires them for N equal to 8, 16, 32, and 64 if the implementation has
a type with the required properties. So they would be required on things
like x86 and ARM architectures.

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Clive D.W. Feather          | If you lie to the compiler,
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