GSSAPI support for mailwatch panel plugin

[Charles Leclerc]

Hello everyone,

This is my first contribution to XFCE. I needed GSSAPI support for IMAP 
in the mailwatch panel plugin. So I wrote a patch to add this 
functionality to the plugin, with the help of the GSSAPI implementation 
in balsa. I wrote it for POP3 and IMAP because it is very similar.

What I did :

- Add a GSSAPI option in configure.ac.in, the option being disabled by 
default
- Add the GSSAPI authentication protocol for POP3 and IMAP, prior to 
the CRAM MD5 one. If no tickets are available, GSSAPI is cancelled and 
classic authentication is used ; Therefore empty passwords in the 
configuration have to be allowed.
- My best to respect the coding style of the plugin.

I tested it myself and it seems to work well. I attached the patch to 
this message and wondered if it would be useful to open an enhancement 
ticket in bugzilla, for upstream use.

Regards,
Charles
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