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>

build.sh

@@ -13,6 +13,15 @@ case "$OSTYPE" in
   *) exe="" ;;
 esac
 
+# mingw64-specific linker options
+windows_linker=""
+unameOut="$(uname -s)"
+case "$unameOut" in
+  MINGW64_NT*)
+    windows_linker="-static -lws2_32 -pthread"
+    ;;
+esac
+
 rm -f "bareiron$exe"
-gcc src/*.c -O3 -Iinclude -o "bareiron$exe"
+gcc src/*.c -O3 -Iinclude -o "bareiron$exe" $windows_linker
 "./bareiron$exe"