bury __kernel_nlink_t, make internal nlink_t consistent

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/ia64/include/asm/posix_types.h

@@ -1,9 +1,6 @@
 #ifndef _ASM_IA64_POSIX_TYPES_H
 #define _ASM_IA64_POSIX_TYPES_H
 
-typedef unsigned int	__kernel_nlink_t;
-#define __kernel_nlink_t __kernel_nlink_t
-
 typedef unsigned long	__kernel_sigset_t;	/* at least 32 bits */
 
 #include <asm-generic/posix_types.h>