Export dump_{write,seek} to binary loader modules

If you build aout support as a module, you'll want these exported.
Reported-by: NTetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/exec.c

@@ -2024,6 +2024,7 @@ int dump_write(struct file *file, const void *addr, int nr)
 {
 	return access_ok(VERIFY_READ, addr, nr) && file->f_op->write(file, addr, nr, &file->f_pos) == nr;
 }
+EXPORT_SYMBOL(dump_write);
 
 int dump_seek(struct file *file, loff_t off)
 {
@@ -2052,3 +2053,4 @@ int dump_seek(struct file *file, loff_t off)
 	}
 	return ret;
 }
+EXPORT_SYMBOL(dump_seek);