qt5base: fix activation of i.MX visual ID workaround

The workaround implemented in 0001-Force_egl_visual_ID_33.patch has to
be enabled as soon as gpu_vivante/xorg is used. This does not depends
on eglfs option.

[Thomas: minor commit log tweaks.]

Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>