Disable coarray_navier_stokes test on Travis-CI

 This was cherry-picked from 173f980 on master,
 but merge conflicts (due to unintened divergence of
 master and 1.x release branch) required manual changes.
 As a side effect, this fixes #42

Author: zbeekman

CMakeLists.txt

@@ -134,9 +134,15 @@ if(opencoarrays_aware_compiler)
   add_mpi_test(coarray_burgers_pde 2 ${tests_root}/integration/pde_solvers/coarrayBurgers/coarray_burgers_pde)
   add_mpi_test(co_heat 2 ${tests_root}/integration/pde_solvers/coarrayHeatSimplified/co_heat)
 
+  execute_process (COMMAND uname -m
+                   OUTPUT_VARIABLE MACHINE_TYPE)
   if ("${CMAKE_SYSTEM_NAME}" MATCHES "Linux" )
-    add_mpi_test(coarray_navier_stokes 2 ${tests_root}/integration/pde_solvers/navier-stokes/coarray_navier_stokes)
-    set_property(TEST coarray_navier_stokes PROPERTY PASS_REGULAR_EXPRESSION "Test passed.")
+    if ("${MACHINE_TYPE}" MATCHES "x86_64")
+      if ( NOT (DEFINED ENV{TRAVIS}))
+	add_mpi_test(coarray_navier_stokes 2 ${tests_root}/integration/pde_solvers/navier-stokes/coarray_navier_stokes)
+	set_property(TEST coarray_navier_stokes PROPERTY PASS_REGULAR_EXPRESSION "Test passed.")
+      endif()
+    endif()
   endif()
 else()
   add_test(co_sum_extension ${tests_root}/unit/extensions/test-co_sum-extension.sh)