Spawn.h not found in windows.
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
-#include <spawn.h>
#ifdef JANET_WINDOWS
#include <windows.h>
#include <sys/utime.h>
#include <io.h>
#else
+#include <spawn.h>
#include <utime.h>
#include <unistd.h>
#include <dirent.h>
