patch 8.0.0959: build failure on MS-Windows

Problem:    Build failure on MS-Windows.
Solution:   Use ioctlsocket() instead of fcntl().
diff --git a/src/version.c b/src/version.c
index 903b13e..7b17219 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    959,
+/**/
     958,
 /**/
     957,