GTK shipped the ngl (new GL) renderer last year and deprecated the
legacy gl renderer. In GTK 4.17 this renderer has been removed entirely,
which means the devices that were forcing the use of this legacy
renderer need to now fallback to software rendering instead.
Fixes: https://gitlab.postmarketos.org/postmarketOS/pmaports/-/issues/3533
Signed-off-by: Sam Day <me@samcday.com>
[ci:skip-build]: already built successfully in CI