nbench-byte: Fix parallel building error

This extends the dependencies on pointer.h to fix following error:

| ./sysinfo.sh arm-poky-linux-gnueabi-gcc ...
| In file included from misc.h:36:0,
|                  from misc.c:23:
| nmglobal.h:29:21: fatal error: pointer.h: No such file or directory
|  #include "pointer.h"
|                      ^
| compilation terminated.
| make: *** [misc.o] Error 1
| make: *** Waiting for unfinished jobs....
| ERROR: oe_runmake failed
| WARNING: exit code 1 from a shell command.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>