add "build.fence" policy to block all targets build in depend chain #5011
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issue url: #5003
考虑场景 Gen <- A <- B <- C
Gen 使用了 set_policy("build.fence", true)，则 Gen 会阻塞 A、B、C 的构建，当 Gen 完成后，A、B、C 按照原先规则进行编译