mboxviews: Use QP for payloads with lines over 78 characters

RFC 5322 requires us to not have lines longer than 998 characters and
strongly suggests that we should impose even stricter limitation of 78
characters.

Let's follow that recommendation and use quoted-printable transfer
encoding if any line of payload is longer than 78 characters.

Reported-by: Petri Latvala <petri.latvala@intel.com>
Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
1 job for master in 1 minute and 29 seconds
Status Job ID Name Coverage
  Test
passed #2406003
test

00:01:29