MoltenVK, at least upto 1.2.141, does not render triangle fans. This is reflected in the portability EXTX extension.
This code get the extensions properties and features and then sets the have_triangle_fans.
This extension is not avaiable on all systems, so an amout of the code has to be protected by the define VK_EXTX_PORTABILITY_SUBSET_EXTENSION_NAME.
Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7457>
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