remove asm/system.h

root cause commits in linux-stable:
commit 0195c00244dc2e9f522475868fa278c473ba7339
Merge: f21ce8f 141124c
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Wed Mar 28 15:58:21 2012 -0700

    Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system
snull: replace NETIF_F_NO_CSUM to NETIF_F_HW_CSUM

root cause commits in linux-stable:
commit 34324dc2bf27c1773045fea63cb11f7e2a6ad2b9
Author: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Date:   Tue Nov 15 15:29:55 2011 +0000

    net: remove NETIF_F_NO_CSUM feature bit
simple: rename simple_open

root cause commits in linux-stable:
commit 20955e891d828b2027281fe3295dae6af8e0423b
Author: Stephen Boyd <sboyd@codeaurora.org>
Date:   Thu Apr 5 14:25:09 2012 -0700

    libfs: add simple_open()