qtbase: Temporarily use gl instead of gles2

* something interacts badly with distro-less or world build

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
README: update to depend on master branches

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
opkg: Rename .bbappend to match new version from oe-core

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
connman: Rename .bbappend to match new version from oe-core

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