Remove automatic reinitialization of PKCS#11 after fork

 * First of all one should only call async-signal-safe functions
   from the callbacks of pthread_atfork(), and so we cannot
   reinitialize directly.
 * Some modules use pthread_atfork() to detect forking and setup
   their internal state. If we call into them in our pthread_atfork()
   callback then this is inherently racy.
 * There was danger of endless loops and deadlocks which are caused
   by handlers which fork in their C_Initialize
 * Many processes do fork/exec, reinitializing PKCS#11 for these
   forks is quite resourc intensive when the child process won't use
   PKCS#11 at all.

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