Mark test_clSetEventCallback as WILL_FAIL when TSan is enabled
Mark test_clSetEventCallback as WILL_FAIL when TSan is enabled

due to how the test is written, TSan will inevitably complain.

franz/pocl,franz/pocl,Oblomov/pocl,Oblomov/pocl,pocl/pocl,franz/pocl,pocl/pocl,pocl/pocl,Oblomov/pocl,pocl/pocl,Oblomov/pocl,pocl/pocl,franz/pocl,Oblomov/pocl,franz/pocl