[strace/strace] .gitignore: add missing files that should be ignored (#157)

[codecov[bot]]

# [Codecov](https://codecov.io/gh/strace/strace/pull/157?src=pr&el=h1) Report
> Merging [#157](https://codecov.io/gh/strace/strace/pull/157?src=pr&el=desc) into [master](https://codecov.io/gh/strace/strace/commit/8077af8188288f172a7548f5bc213697232f852d?el=desc) will **decrease** coverage by `0.00%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/strace/strace/pull/157/graphs/tree.svg?width=650&height=150&src=pr&token=Uoc5vM53zG)](https://codecov.io/gh/strace/strace/pull/157?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master     #157      +/-   ##
==========================================
- Coverage   86.90%   86.90%   -0.01%     
==========================================
  Files         263      263              
  Lines       18325    18325              
==========================================
- Hits        15926    15925       -1     
- Misses       2399     2400       +1     
```


| [Impacted Files](https://codecov.io/gh/strace/strace/pull/157?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pidns.c](https://codecov.io/gh/strace/strace/pull/157/diff?src=pr&el=tree#diff-cGlkbnMuYw==) | `94.11% <0.00%> (-0.46%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/strace/strace/pull/157?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/strace/strace/pull/157?src=pr&el=footer). Last update [8077af8...82dd2d8](https://codecov.io/gh/strace/strace/pull/157?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).


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