egl/dri: flesh out and use dri2_create_drawable()

Wrap the loader->createNewDrawable() dance into a helper and use it
throughout the codebase.

This addresses a cases like surfaceless (SL) on swrast (SL on kms_swrast
is fine) where we'd attempt using the wrong driver and crash out.

v2: fixup quirky GBM (Mathias)
v3: fixup GBM for real (Marek)

Cc: [email protected]
Cc: Mathias Fröhlich <[email protected]>
Reviewed-by: Mathias Fröhlich <[email protected]> (v1)
Reviewed-by: Marek Olšák <[email protected]> (v1)
Signed-off-by: Emil Velikov <[email protected]> (v2)
Signed-off-by: Marek Olšák <[email protected]> (v2)
Reviewed-by: Emil Velikov <[email protected]>

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