define vma_aligned_alloc

Index: core/deps/VulkanMemoryAllocator/include/vk_mem_alloc.h
--- core/deps/VulkanMemoryAllocator/include/vk_mem_alloc.h.orig
+++ core/deps/VulkanMemoryAllocator/include/vk_mem_alloc.h
@@ -2669,7 +2669,7 @@ static void* vma_aligned_alloc(size_t alignment, size_
 
     return memalign(alignment, size);
 }
-#elif defined(__APPLE__) || defined(__ANDROID__) || (defined(__linux__) && defined(__GLIBCXX__) && !defined(_GLIBCXX_HAVE_ALIGNED_ALLOC))
+#elif defined(__OpenBSD__) || defined(__APPLE__) || defined(__ANDROID__) || (defined(__linux__) && defined(__GLIBCXX__) && !defined(_GLIBCXX_HAVE_ALIGNED_ALLOC))
 #include <cstdlib>
 
 #if defined(__APPLE__)
