#454 [lxsession]fix gtk3 hide_all()

[marguerite]

*_hide_all() is removed since gtk 3.0

This patch is not good, but a quick fix.

I think you may need a detection in vala code to see if it's gtk3 (I don't how to code that part)

[marguerite]

hide_all is remove in gtk3

[gilir]

Thanks for the patch. I adpated it and push it to git.