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system(): on command == NULL, return nonzero if shell exists

Florian Meißner requested to merge t-nil/relibc:functions/system/return_shell_exists into master

From man system.3:

   The return value of system() is one of the following:

   *  If command is NULL, then a nonzero value if a shell is
      available, or 0 if no shell is available.

This makes relibc system() conform to POSIX in that regard (and also adds a test).

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