vulkan: fix build on machines without vulkan 1.3

src/modules/graphics/vulkan/Graphics.cpp

@@ -901,7 +901,10 @@ void Graphics::initVMA() {
 
 	allocatorCreateInfo.pVulkanFunctions = &vulkanFunctions;
 #else
-	allocatorCreateInfo.pVulkanFunctions = nullptr;
+	VmaVulkanFunctions vulkanFunctions{};
+	vulkanFunctions.vkGetInstanceProcAddr = &vkGetInstanceProcAddr;
+	vulkanFunctions.vkGetDeviceProcAddr = &vkGetDeviceProcAddr;
+	allocatorCreateInfo.pVulkanFunctions = &vulkanFunctions;
 #endif
 
 	if (vmaCreateAllocator(&allocatorCreateInfo, &vmaAllocator) != VK_SUCCESS) {

src/modules/graphics/vulkan/UseVMA.cpp

@@ -1,2 +1,4 @@
+#include "VulkanWrapper.h"
+
 #define VMA_IMPLEMENTATION
 #include "vk_mem_alloc.h"

src/modules/graphics/vulkan/VulkanWrapper.h

@@ -9,6 +9,8 @@
 #define VMA_DYNAMIC_VULKAN_FUNCTIONS 0
 #else
 #include <vulkan/vulkan.h>
+#define VMA_STATIC_VULKAN_FUNCTIONS 0
+#define VMA_DYNAMIC_VULKAN_FUNCTIONS 1
 #endif
 
 #endif //LOVE_GRAPHICS_VULKAN_VULKANWRAPPER_H