LU-709 build: cleanup LC_PAGE_CHECKED and LC_INODE_BLKSIZE

LU-709 build: cleanup LC_PAGE_CHECKED and LC_INODE_BLKSIZE

1. kernel has PageChecked() and SetPageChecked() since v2.6.18
2. struct inode doesn't have i_blksize since v2.6.18

Signed-off-by: Peng Tao <tao.peng@emc.com>
Change-Id: Ic50941948ae409ea526108f43e1337db2141ae3d
Reviewed-on: http://review.whamcloud.com/2323
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>