Use the basic render loop for NVIDIA GPUs on X11 too

Nate Grahamrequested to merge
ngraham/kdeclarative:basic-renderer-for-nvidia-on-x11-too into master

There are also use cases worked around by doing this on X11, not just Wayland. For example: https://bugs.kde.org/show_bug.cgi?id=419421.

BUG: 419421 FIXED-IN: 5.86

cc @davidedmundson @davidre

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