meta-efl: upgrade efl to 1.7.9, e-wm to 0.17.5

* announcement:
  http://www.mail-archive.com/enlightenment-devel@lists.sourceforge.net/msg56588.html


* most likely last bump I'll do in meta-efl before upgrading recipes to 1.8

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>