tests: Use internal allocation for test_fixtures.
tests: Use internal allocation for test_fixtures.

jhrozek/cmocka,VladimirTyrin/cmocka,jamesmunns/CMocka,dsch/cmocka,nuumio/cmocka,nuumio/cmocka,clibs/cmocka,jschmidlapp/cmocka,jhrozek/cmocka,Odie/cmocka,nuumio/cmocka,VladimirTyrin/cmocka,JonathonReinhart/cmocka,lsjostro/cmocka,Odie/cmocka,tyc/cmocka,jschmidlapp/cmocka,clibs/cmocka,tyc/cmocka,wingyplus/cmocka,tyc/cmocka,dsch/cmocka,wingyplus/cmocka,Odie/cmocka,jamesmunns/CMocka,lsjostro/cmocka,JonathonReinhart/cmocka,jhrozek/cmocka,jschmidlapp/cmocka