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xwayland: fix GBM on driver without explicit modifiers

Simon Ser requested to merge emersion/xserver:fix-implicit-mods into master

Some drivers (e.g. AMD GFX8-) don't support explicit format modifiers. On these drivers, gbm_bo_create_with_modifiers() will fail. This results in "Error getting buffer" in the logs later on with all X11 windows staying invisible.

Fallback to the modifier-less API gbm_bo_create() in that case.

Signed-off-by: Simon Ser

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