gmime porting 2.0 to 2.4

[Bernard Johnson]

Jesse Keating wrote:
> Gmime recently moved from 2.0 to 2.4 and broke a couple things in its
> wake.  Namely pan and dbmail.  Just hacking their configure scripts to
> find and use gmime-2.4 didn't work, compile errors.  Anybody want to
> give a go at porting these to gmime-2.4?

libzdb just past review and was imported today so I'll be upgrading 
dbmail to a newer version that is compatible with with gmime-2.4.