support native windows binary compilation

* add winsock2 to globals.c

* add winsocket2 compatibility to main function

* add winsocket2 to packets.c

* and winsocket2 to procedures.c

* add winsocket 2 compatibility to tools.c

* add winsocket2 to varnum.c

* add mingw64 linker options to build.sh

* fix build

* style nitpicks

* remove old_fd

* update compilation instructions for windows

---------

Co-authored-by: p2r3 <41925384+p2r3@users.noreply.github.com>

src/packets.c

@@ -6,7 +6,12 @@
   #include "lwip/netdb.h"
   #include "esp_task_wdt.h"
 #else
-  #include <arpa/inet.h>
+  #ifdef _WIN32
+    #include <winsock2.h>
+    #include <ws2tcpip.h>
+  #else
+    #include <arpa/inet.h>
+  #endif
   #include <unistd.h>
 #endif