vk_mem_alloc.h: Patch for C++14 compilation on Linux, BSDs

lib/ivis_opengl/3rdparty/vk_mem_alloc.h

@@ -2956,6 +2956,9 @@ static void* vma_aligned_alloc(size_t alignment, size_t size)
 #else
 static void* vma_aligned_alloc(size_t alignment, size_t size)
 {
+# ifndef VMA_SYSTEM_ALIGNED_MALLOC
+    #error No available implementation for vma_aligned_alloc
+# endif
     VMA_ASSERT(0 && "Could not implement aligned_alloc automatically. Please enable C++17 or later in your compiler or provide custom implementation of macro VMA_SYSTEM_ALIGNED_MALLOC (and VMA_SYSTEM_ALIGNED_FREE if needed) using the API of your system.");
     return VMA_NULL;
 }