Fixed bug 4484 - use SIMD aligned memory for SDL_Surface

Surfaces are allocated using SDL_SIMDAlloc()
They are marked with SDL_SIMD_ALIGNED flag to appropriatly free them with SDL_SIMDFree()
(Flag is cleared when pixels is free'd in RLE, in case user would hijack the pixels ptr)

When providing its own memory pointer (SDL_CreateRGBSurfaceFrom()) and clearing
SDL_PREALLOC  to delegate to SDL the memory free, it's the responsability of the user
to add SDL_SIMD_ALIGNED or not, whether the pointer has been allocated with SDL_malloc() or
SDL_SIMDAlloc().

src/video/SDL_surface.c

@@ -120,12 +120,13 @@ SDL_CreateRGBSurfaceWithFormat(Uint32 flags, int width, int height, int depth,
             return NULL;
         }
 
-        surface->pixels = SDL_malloc((size_t)size);
+        surface->pixels = SDL_SIMDAlloc((size_t)size);
         if (!surface->pixels) {
             SDL_FreeSurface(surface);
             SDL_OutOfMemory();
             return NULL;
         }
+        surface->flags |= SDL_SIMD_ALIGNED;
         /* This is important for bitmaps */
         SDL_memset(surface->pixels, 0, surface->h * surface->pitch);
     }