[Dovecot] deliver copies "^From " header lines when delivering to Maildir

[pod]

>>>>> "TS" == Timo Sirainen <tss at iki.fi> writes:

    TS> Well, doing it only if it's the first header would make it better.

Sure, I considered that.  I note though that the save_header_callback()
from mbox-save.c also does not make this distinction and will strip a
"^From " anywhere in the headers so I am going to claim I followed suit on
grounds of consistency :-)