Add a missing include
Add a missing include

MinGW reported that macros S_IRUSR, S_IWUSR, etc. used in this file aren't
defined. That is because these macros are defined in sys/stat.h which
wasn't included here. GCC on Linux somehow survived that with no warnings.

mpreisler/openscap,redhatrises/openscap,mpreisler/openscap,OpenSCAP/openscap,jan-cerny/openscap,mpreisler/openscap,redhatrises/openscap,jan-cerny/openscap,jan-cerny/openscap,mpreisler/openscap,jan-cerny/openscap,jan-cerny/openscap,redhatrises/openscap,redhatrises/openscap,jan-cerny/openscap,mpreisler/openscap,redhatrises/openscap,OpenSCAP/openscap,redhatrises/openscap,mpreisler/openscap,OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap