LibC: Move duplicated winsize struct definition into ioctl_numbers.h

Author: https://github.com/deoxxa
Commit: https://github.com/SerenityOS/serenity/commit/1868523e007
Pull-request: https://github.com/SerenityOS/serenity/pull/463

Kernel/UnixTypes.h

@@ -215,11 +215,6 @@
 #define TCSADRAIN 1
 #define TCSAFLUSH 2
 
-struct winsize {
-    unsigned short ws_row;
-    unsigned short ws_col;
-};
-
 typedef u32 dev_t;
 typedef u32 ino_t;
 typedef u16 mode_t;

Libraries/LibC/sys/ioctl.h

@@ -5,11 +5,6 @@
 
 __BEGIN_DECLS
 
-struct winsize {
-    unsigned short ws_row;
-    unsigned short ws_col;
-};
-
 int ioctl(int fd, unsigned request, ...);
 
 __END_DECLS

Libraries/LibC/sys/ioctl_numbers.h

@@ -1,5 +1,16 @@
 #pragma once
 
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+struct winsize {
+    unsigned short ws_row;
+    unsigned short ws_col;
+};
+
+__END_DECLS
+
 enum IOCtlNumber {
     TIOCGPGRP,
     TIOCSPGRP,