Fix for Windows (possibly)
Windows does not have <arpa/inet.h> so only include it when not Windows.
#ifdef JANET_NET
#include <math.h>
-#include <arpa/inet.h>
#ifdef JANET_WINDOWS
#include <winsock2.h>
#include <windows.h>
#pragma comment (lib, "Mswsock.lib")
#pragma comment (lib, "Advapi32.lib")
#else
+#include <arpa/inet.h>
#include <unistd.h>
#include <signal.h>
#include <sys/ioctl.h>
