96f3513 Add <stdlib.h> for the exit function, to avoid C99 compiler errors

Authored and Committed by fweimer a year ago
    Add <stdlib.h> for the exit function, to avoid C99 compiler errors
    
    Related to:
    
      <https://fedoraproject.org/wiki/Changes/PortingToModernC>
      <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>
    
        
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