Need 'irq_affinity' array when CONFIG_PROC_FS=n.

With CONFIG_PROC_FS=n, the irq_affinity[NR_IRQS] array
is not available in arch/i386/kernel code:

arch/i386/kernel/built-in.o(.text+0x10037): In function `do_irq_balance':
: undefined reference to `irq_affinity'
arch/i386/kernel/built-in.o(.text+0x101a9): In function `do_irq_balance':
: undefined reference to `irq_affinity'

Signed-off-by: Randy Dunlap <rddunlap@osdl.org>

diffstat:=
  kernel/irq/manage.c |    2 ++
  kernel/irq/proc.c   |    2 --
  2 files changed, 2 insertions(+), 2 deletions(-)