patch 8.1.0987: unnecessary condition in #ifdef
Problem: Unnecessary condition in #ifdef.
Solution: Remove using CYGWIN32. (Ken Takata)
diff --git a/src/xxd/xxd.c b/src/xxd/xxd.c
index c24089e..b9f6041 100644
--- a/src/xxd/xxd.c
+++ b/src/xxd/xxd.c
@@ -71,7 +71,7 @@
# define _CRT_SECURE_NO_DEPRECATE
# define _CRT_NONSTDC_NO_DEPRECATE
#endif
-#if !defined(CYGWIN) && (defined(CYGWIN32) || defined(__CYGWIN__) || defined(__CYGWIN32__))
+#if !defined(CYGWIN) && defined(__CYGWIN__)
# define CYGWIN
#endif