The first two tests are blocking for over 60 seconds in Travis

I don't know why the first tests are always blocking for over 60 seconds. However, after the blocking issue, all testcases can be run without any problem.

```
test gnu::arch::test_x86_64 ... test gnu::arch::test_x86_64 has been running for over 60 seconds
test gnu::base32::test_decode ... test gnu::base32::test_decode has been running for over 60 seconds
```