Unbreak Linux build

  commit 71f4effce79ec0485586963ea764f2c212c72f26
  Author: Alexander Graf <agraf@suse.de>
  Date:   Fri Oct 30 22:27:00 2009 +0100

      Unbreak tap compilation on OS X

Broke the build on Linux due to a bad #if guard

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
