Now including <windows.h> via a common header file specifying the minimum
Windows SDK version required

lib/zip_source_win32w.c

diff --git a/lib/zip_source_win32w.c b/lib/zip_source_win32w.c
index 326e69c..7e2dc15 100644
--- a/lib/zip_source_win32w.c
+++ b/lib/zip_source_win32w.c
@@ -34,8 +34,8 @@
 
 #include <errno.h>
 #include <stdio.h>
-#include <windows.h>
 
+#include "zipwin32.h"
 #include "zipint.h"
 
 static void *_win32_strdup_w(const void *str);