mailinfo: get rid of function-local static states

Two helper functions use "static int" in their scope to keep track
of the state while repeatedly getting called once for each input
line.  Move these state variables to their ultimate caller and pass
down pointers to them along the callchain, as a small step in
preparation for making this entire callchain more reentrant.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

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