The test-core_func_integer testcase fails on big endian arches (s390(x), ppc64)

from build.log
...
 21/100 Test  #21: test-core_func_geometric ...........   Passed    0.00 sec
        Start  22: test-core_func_integer
 22/100 Test  #22: test-core_func_integer .............***Failed    0.01 sec
        Start  23: test-core_func_integer_bit_count
 23/100 Test  #23: test-core_func_integer_bit_count ...   Passed    0.01 sec
        Start  24: test-core_func_integer_find_lsb
...

for full log please see
http://s390.koji.fedoraproject.org/koji/taskinfo?taskID=1712779 or
http://ppc.koji.fedoraproject.org/koji/taskinfo?taskID=2288784

When running the test manually I get

[sharkcz@devel3 build]$ ctest --output-on-failure -V -R test-core_func_integer
UpdateCTestConfiguration  from :/home/sharkcz/glm/glm/build/DartConfiguration.tcl
UpdateCTestConfiguration  from :/home/sharkcz/glm/glm/build/DartConfiguration.tcl
Test project /home/sharkcz/glm/glm/build
Constructing a list of tests
Done constructing a list of tests
Checking test dependency graph...
Checking test dependency graph end
test 22
    Start 22: test-core_func_integer

22: Test command: /home/sharkcz/glm/glm/build/test/core/test-core_func_integer
22: Test timeout computed to be: 9.99988e+06
1/4 Test #22: test-core_func_integer .............***Failed    0.00 sec

test 23
    Start 23: test-core_func_integer_bit_count

23: Test command: /home/sharkcz/glm/glm/build/test/core/test-core_func_integer_bit_count
23: Test timeout computed to be: 9.99988e+06
2/4 Test #23: test-core_func_integer_bit_count ...   Passed    0.00 sec
test 24
    Start 24: test-core_func_integer_find_lsb

24: Test command: /home/sharkcz/glm/glm/build/test/core/test-core_func_integer_find_lsb
24: Test timeout computed to be: 9.99988e+06
3/4 Test #24: test-core_func_integer_find_lsb ....   Passed    0.00 sec
test 25
    Start 25: test-core_func_integer_find_msb

25: Test command: /home/sharkcz/glm/glm/build/test/core/test-core_func_integer_find_msb
25: Test timeout computed to be: 9.99988e+06
4/4 Test #25: test-core_func_integer_find_msb ....   Passed    0.00 sec

The following tests passed:
	test-core_func_integer_bit_count
	test-core_func_integer_find_lsb
	test-core_func_integer_find_msb

75% tests passed, 1 tests failed out of 4

Total Test time (real) =   0.01 sec

The following tests FAILED:
	 22 - test-core_func_integer (Failed)
Errors while running CTest


Version-Release number of selected component (if applicable):
glm-0.9.6.1-1.fc22