Add support for EGL external platforms
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graphics: Add support for enumerating EGL external platforms
These are used by the NVIDIA proprietary driver for integration with non-X11 display technologies such as Wayland and gbm.
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pressure-vessel: Collect EGL external platforms from graphics stack
This should allow the NVIDIA proprietary EGL driver to operate on Wayland, if it is a sufficiently new version.
steamrt/tasks#67, https://github.com/ValveSoftware/steam-runtime/issues/485