[core] portability fix if st_mtime not defined
@@ -1074,6 +1074,8 @@ static int stat_cache_stat_eq(const struct stat * const sta, const struct stat *
#else
sta->st_mtim.tv_nsec == stb->st_mtim.tv_nsec
#endif
+ #else
+ 1
#endif
&& sta->st_mtime == stb->st_mtime
&& sta->st_size == stb->st_size
