enable docker ppp

hc

2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87

 kernel/tools/virtio/asm/barrier.h
..
..
@@ -1,4 +1,5 @@
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 /* SPDX-License-Identifier: GPL-2.0 */
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+#include <stdlib.h>
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 #if defined(__i386__) || defined(__x86_64__)
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 #define barrier() asm volatile("" ::: "memory")
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 #define virt_mb() __sync_synchronize()