[strace/strace] tests: add #!/bin/sh where necessary (PR #202)

[codecov[bot]]

# [Codecov](https://codecov.io/gh/strace/strace/pull/202?src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=strace) Report
> Merging [#202](https://codecov.io/gh/strace/strace/pull/202?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=strace) (8f7de61) into [master](https://codecov.io/gh/strace/strace/commit/df89e8bb642dbe63b3a6f82bb571d1b1139d1439?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=strace) (df89e8b) will **decrease** coverage by `0.00%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/strace/strace/pull/202/graphs/tree.svg?width=650&height=150&src=pr&token=Uoc5vM53zG&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=strace)](https://codecov.io/gh/strace/strace/pull/202?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=strace)

```diff
@@            Coverage Diff             @@
##           master     #202      +/-   ##
==========================================
- Coverage   90.08%   90.08%   -0.01%     
==========================================
  Files         286      286              
  Lines       23903    23903              
==========================================
- Hits        21533    21532       -1     
- Misses       2370     2371       +1     
```


| [Impacted Files](https://codecov.io/gh/strace/strace/pull/202?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=strace) | Coverage Δ | |
|---|---|---|
| [src/pidns.c](https://codecov.io/gh/strace/strace/pull/202/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=strace#diff-c3JjL3BpZG5zLmM=) | `94.44% <0.00%> (-0.51%)` | :arrow_down: |

------

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