patch 8.2.4316: __CYGWIN32__ is not defined on 64 bit systems

Problem:    __CYGWIN32__ is not defined on 64 bit systems.
Solution:   Update #ifdefs. (Ken Takata, closes #9709)
diff --git a/src/version.c b/src/version.c
index 8d0dece..3caad5f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4316,
+/**/
     4315,
 /**/
     4314,