gl/context: fill a GError on platform-specific fill_info() error
Fixes bindings assuming that GError is always set on error: !809 (comment 957493) !809 (comment 957494) !809 (comment 957498)
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Fixes bindings assuming that GError is always set on error: !809 (comment 957493) !809 (comment 957494) !809 (comment 957498)