[klibc] include: [sys/types.h] bury __kernel_nlink_t

We don't use it anywhere and it is gone on linux side
with bb8ac181a5cf50458a0d83b4460790badc9fdc16 for 3.5-rc1.
Fixes compiling against latest linux.

Signed-off-by: maximilian attems <max@stro.at>
diff --git a/usr/include/sys/types.h b/usr/include/sys/types.h
index 229f7d6..b8cdb8c 100644
--- a/usr/include/sys/types.h
+++ b/usr/include/sys/types.h
@@ -25,7 +25,6 @@
 typedef uint32_t dev_t;
 typedef __kernel_ino_t ino_t;
 typedef __kernel_mode_t mode_t;
-typedef __kernel_nlink_t nlink_t;
 typedef __kernel_loff_t off_t;
 typedef __kernel_loff_t loff_t;
 typedef __kernel_pid_t pid_t;