[jdk17u] RFR: 8274293: Build failure on macOS with Xcode 13.0 as vfork is deprecated

[xpbob]

On Tue, 12 Oct 2021 03:42:27 GMT, xpbob <duke at openjdk.java.net> wrote:

> Backport 252aaa9249d8979366b37d59487b5b039d923e35
> 
> bug link:https://bugs.openjdk.java.net/browse/JDK-8274293

Forgetting to enable tests

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PR: https://git.openjdk.java.net/jdk17u/pull/182