patch 8.1.0983: checking __CYGWIN32__ unnecessarily

Problem:    Checking __CYGWIN32__ unnecessarily.
Solution:   Remove the checks. (Ken Takata)
diff --git a/src/version.c b/src/version.c
index 8e9c87a..e2e82f5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -780,6 +780,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    983,
+/**/
     982,
 /**/
     981,