libgmime installation and build requirements

[Scott Lenser]

> Here's how it currently looks like, it's incomplete and won't work and
> breaks the current stuff, and doesn't yet have base64/quotedprintable
> decoders.
> 
> +BCHARSNOSPC	[0-9a-zA-Z'()+_,-./:=?]
> +BCHARS		[ 0-9a-zA-Z'()+_,-./:=?]
> +MIME_BOUNDARY	{BCHARS}*{BCHARSNOSPC}
>  
[snip]
> +^--{MIME_BOUNDARY}(--)?$			{ mime_boundary(); return (BOUNDARY); }
>  

Won't this eat some normal lines like:

--URGENT--

Granted these won't happen often, but they are certainly allowed by the standards.

- Scott