um: Include kbuild.h instead of duplicating its macros

#include <linux/sched.h>

#include <linux/elf.h>

#include <linux/crypto.h>

#include <linux/kbuild.h>

#include <asm/mman.h>

#define DEFINE(sym, val) \

	asm volatile("\n->" #sym " %0 " #val : : "i" (val))

#define BLANK() asm volatile("\n->" : : )

#define OFFSET(sym, str, mem) \

	DEFINE(sym, offsetof(struct str, mem));

void foo(void)

{

#include <common-offsets.h>