Fix _socket module compilation on Cygwin. (GH-4137) (GH-4145)

miss-islington · serhiy-storchaka · commit e650fd362ee7 · 2018-02-26T22:24:18.000+02:00
(cherry picked from commit 63ae044)
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
@@ -240,7 +240,7 @@ if_indextoname(index) -- return the corresponding interface name\n\
 # include <ctype.h>
 #endif
 
-#if defined(__APPLE__) || defined(__NetBSD__)
+#if defined(__APPLE__) || defined(__CYGWIN__) || defined(__NetBSD__)
 # include <sys/ioctl.h>
 #endif
 
