On timestamps such as " 4-Mar-2018 16:49:25 -0500", mbsync would abort if
the Channel option `CopyArrivalDate' was set.
The IMAP protocol specifies a date format beginning with a day-of-month
space-padded to two characters. The "%d" specifier in glibc's strptime(3)
will consume a space-padded day of month, but OpenBSD's "%d" only accepts
leading zeroes.
Prodded by this issue, our strptime(3) now strips leading spaces with "%e"
as of lib/libc/time/strptime.c r1.25.
Found, analysed and patch (using "%n%d" instead of "%e") from
Evan Silberman <evan at jklol dot net>, thanks!
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