We should not leak the handle to the jimage file (lib/modules) to childs.
JDK-8194734 did solve this for windows. We should use FD_CLOEXEC on Posix as well.
Note that this only poses a problem when a child process is spawned off not via `Runtime.exec` but via another route since the spawnhelper closes all file descriptors.
            
Note that this only poses a problem when a child process is spawned off not via `Runtime.exec` but via another route since the spawnhelper closes all file descriptors.
- relates to
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                    JDK-8194734 Handle to jimage file inherited into child processes (win) -           
- Closed
 
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- links to
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                     Review
        openjdk/jdk/4991 Review
        openjdk/jdk/4991