Fix the error "use of undeclared identifier 'WIFEXITED'" by adding #include <sys/wait.h>

[yurivict]

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[wsnyder]

I suspect this header isn't in windows, so needs to be included under sys/time.h in the ifdef.

Also please add your github name to docs/CONTRIBUTORS - you'll get a test failure soon otherwise.

[yurivict]

I've updated the pull request.

[wsnyder]

Thanks. Pushed this manually to avoid the dist test issue.

[poucotm]

Hi, I think the patch is needed also for windows (Mingw). The same errors occur when compiling for windows. I added codes below with reference to sys/wait.h

V3Os.cpp :

// clang-format off
#if defined(_WIN32) || defined(__MINGW32__)
# include <windows.h>   // LONG for bcrypt.h on MINGW
# include <bcrypt.h>  // BCryptGenRandom
# include <chrono>
# include <direct.h>  // mkdir
# include <psapi.h>   // GetProcessMemoryInfo
# include <thread>
# ifndef WIFEXITED
#  define WIFEXITED(w)    (((w) & 0xff) == 0)
#  define WIFSIGNALED(w)  (((w) & 0x7f) > 0 && (((w) & 0x7f) < 0x7f))
#  define WIFSTOPPED(w)   (((w) & 0xff) == 0x7f)
#  define WEXITSTATUS(w)  (((w) >> 8) & 0xff)
#  define WTERMSIG(w) ((w) & 0x7f)
#  define WSTOPSIG    WEXITSTATUS
# endif
#else
# include <sys/time.h>
# include <sys/wait.h> // Needed on FreeBSD for WIFEXITED
# include <unistd.h>  // usleep
#endif
// clang-format on

[wsnyder]

@poucotm are you saying an additional include of sys/wait.h is needed? If so could you please consider making a pull request with it?