bug#33939: 26.1; Avoid loading libs eagerly or unnecessarily in mhtml-mode/sgml-mode

[Leo Liu]

On 2019-01-06 17:25 +0200, Eli Zaretskii wrote:
> OK.  Would you be okay with doing only the first of these,
> i.e. avoiding to load flyspell, on the emacs-26 branch?  Or is the use
> of seq.el still slowing down the load significantly?

I just discovered that css-mode.el also unnecessarily loads eww which in
turn loads gazillion of other things (including gnus).

Do you mind if I also remove (require 'eww) from css-mode.el? This
shaves off another 800ms making (require 'mhtml-mode) at a more
reasonable 650ms. Sound like a win ;)

Leo