Symptom: using nnimap with gssapi authentication (with external imtest
program), unable to upload messages.

Problem: the APPEND command needs to know the exact size of the
message to be uplaoded, which should be calculated using two-byte line
terminator size.  Unlike other transports, imtest requires "\n" as
line the terminator instead of "\r\n".  Gnus calculates the size after
changing the line terminator to "\n", causing wrong result.

Solution: in imap-gssapi-open, set imap-calculate-literal-size-first
to the correct value, besides imap-client-eol, as seen in
imap-kerberos4-open.

Other possible occurrence: imap-shell-open also sets imap-client-eol
but not imap-calculate-literal-size-first.  As I'm unable to test
this, not included in the patch.


Patch: