Revert "projects/*: switch to kernel R8188EU driver"

This reverts commit 277991c44b3ec2d4410cd8b3c77c1d75b4417556.

Conflicts:
	projects/ATV/options
	projects/Generic/options
	projects/RPi/options

Signed-off-by: Stephan Raue <stephan@openelec.tv>
RTL8188EU: add patch to support build with gcc-4.9

Signed-off-by: Stephan Raue <stephan@openelec.tv>
scripts/image: update /etc/os-release

Signed-off-by: Stephan Raue <stephan@openelec.tv>