Commit fc216db4fb789cbd309 introduced a mocked test with binary test data
which fails on big endian machines.
Therefore build the viracpitest test only on little endian machines.
Fixes: fc216db4fb789cbd30917be036d0b94d965bdf7f Signed-off-by: Boris Fiuczynski <fiuczy@linux.ibm.com> Reviewed-by: Marc Hartmayer <mhartmay@linux.ibm.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com>