Refactor internal Crystal::System::Process#fork on UNIX
#16191
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The method now yields to let the caller do something in the child process after fork, rather than always compiling both paths (fork vs fork/exec) even though most applications only use the fork/exec path.
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The method now yields to let the caller do something in the child process after fork, rather than always compiling both paths (fork vs fork/exec) even though most applications only use the fork/exec path.
Extracted from #16174.