vulkan: add dmabuf_support_supported to class

Author: flightlessmango

client/vulkan.h

@@ -144,4 +144,5 @@ class OverlayVK {
     void wait_on_semaphores(const vkroots::VkDeviceDispatch* d);
     void cache_to_transfer_dst(VkCommandBuffer cmd, VkImage image, VkImageLayout old_layout);
     void cache_to_shader_read(VkCommandBuffer cmd, VkImage image, VkImageLayout old_layout);
+    bool is_dmabuf_import_supported(VkFormat format, const Fdinfo& fdinfo);
 };