added __need_timespec macro to make sure timespec struct was defined

[charles-l]

When compiling on Void Linux with glibc version 2.24_4, the compilation was failing because the timespec struct wasn't defined. I added the macro needed to define it.

Relevant part of time.h for reference:

#if (!defined __timespec_defined                                        \
     && ((defined _TIME_H                                               \
          && (defined __USE_POSIX199309                                 \
              || defined __USE_ISOC11))                                 \
         || defined __need_timespec))
# define __timespec_defined     1

# include <bits/types.h>        /* This defines __time_t for us.  */

/* POSIX.1b structure for a time value.  This is like a `struct timeval' but
   has nanoseconds instead of microseconds.  */
struct timespec
  {
    __time_t tv_sec;            /* Seconds.  */
    __syscall_slong_t tv_nsec;  /* Nanoseconds.  */
  };

#endif /* timespec not defined and <time.h> or need timespec.  */
#undef  __need_timespec

[seppo0010]

Thanks