Adapt ext4_utils for windows.

This is not a full port of ext4_utils for windows.
Instead it merely enables use to use the library
for the 'create an empty fs image' functionality
as used by 'fastboot format'.

Change-Id: Ia1ffacd64e4233c4fbb369c4ac5927ccd72ac526
diff --git a/ext4_utils/uuid.c b/ext4_utils/uuid.c
index d518476..33d2494 100644
--- a/ext4_utils/uuid.c
+++ b/ext4_utils/uuid.c
@@ -15,7 +15,12 @@
  */
 
 #include <string.h>
+
+#ifdef USE_MINGW
+#include <winsock2.h>
+#else
 #include <arpa/inet.h>
+#endif
 
 #include "ext4_utils.h"
 #include "sha1.h"