elementary: disable web support

* we don't have webkit-efl in DEPENDS so it depends on build order
  if it's autodetected or not for elementary
* libewebkit0 is quite bit so we don't want to pull it to every image
  with elementary
* and we cannot split elementary web support to different package
  because libewebkit is linked directly from
  libelementary-ver-pre-svn-09.so.0.8.0

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>