[PACKAGES (mail-lib)] Add support for SeaMonkey in browse-url

[Simon Josefsson]

Steve Youngs <steve at sxemacs.org> writes:

> [ I think this was lost in the great ML crash of '06 ]
>
> You know what they say... A Mozilla by any other name is still a
> SeaMonkey.
>
> This adds SeaMonkey to the available browser choices in browse-url.
> Tested here, works fine.

Applied, thanks!

IMHO browse-url.el could be refactored somewhat, there is a lot of
code duplication in it now.  O well.

/Simon