[MERGE][#139318] bzr send @ win32: ensure that command line to invoking Thunderbird is 8-bit string, not unicode (because subprocess does not understand non-ascii unicode)

[Alexander Belchenko]

This patch fixes problem with UnicodeEncodeError and subprocess module @ win32.
Actually I need this fix only for Thunderbird, default MapiClient is not affected
by unicode bug. So if someone think that subject.encode(user_encdoing, 'replace')
should be only in Thunderbird class, I'll move it there.
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