libroot_debug: Add aligned_alloc implementation.

Fixes #17407.

src/system/libroot/posix/malloc_debug/malloc_debug_api.cpp

@@ -242,6 +242,16 @@ memalign(size_t alignment, size_t size)
 }
 
 
+extern "C" void*
+aligned_alloc(size_t alignment, size_t size)
+{
+	if ((size % alignment) != 0)
+		return NULL;
+
+	return sCurrentHeap->memalign(alignment, size);
+}
+
+
 extern "C" void*
 malloc(size_t size)
 {