[Patch] Simplify (and speed-up) do_get_year

[Paolo Carlini]

Hi,

noticed while working on 12791: we can spare the very slow __convert_to_v
call (in the "C" locale, anyway) for such a simple input: just narrow,
check that is a digit ('0' - '9') and convert to integer with a trivial
small loop.

Tested x86-linux. Ok with everyone?

Paolo.

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