LU-2982 build: make AC check for linux arch sandbox friendly

I didn't found any usage of LINUXARCH definition in sources now.
But this check is problematic in sandbox. Therefore, I removed
it from sources at all.

Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Change-Id: Ibdf0a3c26950a59d7f9cc51687d725d9c8835374
Reviewed-on: http://review.whamcloud.com/9458


Tested-by: Jenkins
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Alexey Shvetsov <alexxy@gentoo.org>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>