backport of libgmime for Debian Squeeze

[David Bremner]

Hi Mirco;

I'd like to backport notmuch 0.6.1 for Debian Squeeze, but I think this only
makes sense if we also have a libgmime backport.  I think it is trivial
to backport gmime (I did it for my personal use and it was just a
recompile iirc). Consquently I don't mind doing the backport, but of
course if you would rather do it, that would be great.

All the best,

David