Add charset/us-ascii into body/bodystructure replies if no charset is given for text/* body parts.
Add charset/us-ascii into body/bodystructure replies if no charset is given
for text/* body parts.

--HG--
branch : HEAD

dscho/dovecot,jwm/dovecot-notmuch,dscho/dovecot,jwm/dovecot-notmuch,jkerihuel/dovecot,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jkerihuel/dovecot,jkerihuel/dovecot,dscho/dovecot,jkerihuel/dovecot,jkerihuel/dovecot,dscho/dovecot,dscho/dovecot,jwm/dovecot-notmuch