Kernel/LibC: Replace terminal syscalls with ioctls

isatty, tc{get,set}attr, tc{get,set}pgrp are now implemented as ioctls
instead of separate syscalls

userspace/libraries/LibC/include/sys/ioctl.h

@@ -49,8 +49,14 @@ struct winsize
 	unsigned short ws_xpixel; /* unused by kernel */
 	unsigned short ws_ypixel; /* unused by kernel */
 };
-#define TIOCGWINSZ	50
-#define TIOCSWINSZ	51
+#define TIOCGWINSZ 50
+#define TIOCSWINSZ 51
+#define TCGETS      52
+#define TCSETS      53
+#define TCSETSW     54
+#define TCSETSF     55
+#define TIOCGPGRP   56
+#define TIOCSPGRP   57
 
 struct snd_volume_info
 {