Add missing include in vk_layer_dispatch_table.h

After fixing a compilation error where PFN_GetPhysicalDeviceProcAddr was
defined multiple times, the vk_layer_dispatch_table.h header lacks the
required include that provided PFN_GetPhysicalDeviceProcAddr.

Author: charles-lunarg

loader/generated/vk_layer_dispatch_table.h

@@ -29,6 +29,7 @@
 #pragma once
 
 #include <vulkan/vulkan.h>
+#include <vulkan/vk_layer.h>
 
 // Instance function pointer dispatch table
 typedef struct VkLayerInstanceDispatchTable_ {

scripts/generators/loader_extension_generator.py

@@ -242,6 +242,7 @@ def print_vk_layer_dispatch_table(self, out):
         out.append('#pragma once\n')
         out.append('\n')
         out.append('#include <vulkan/vulkan.h>\n')
+        out.append('#include <vulkan/vk_layer.h>\n')
         out.append('\n')
         self.OutputLayerInstanceDispatchTable(out)
         self.OutputLayerDeviceDispatchTable(out)