add support for fedora linux

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.10% :warning:

Comparison is base (4965906) 76.29% compared to head (1d8c6bc) 76.20%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #124 +/- ## ========================================== - Coverage 76.29% 76.20% -0.10% ========================================== Files 97 97 Lines 7046 7048 +2 ========================================== - Hits 5376 5371 -5 - Misses 1670 1677 +7 ``` | [Files Changed](https://app.codecov.io/gh/romange/helio/pull/124?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Roman+Gershman) | Coverage Δ | | |---|---|---| | [util/fibers/fibers\_test.cc](https://app.codecov.io/gh/romange/helio/pull/124?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Roman+Gershman#diff-dXRpbC9maWJlcnMvZmliZXJzX3Rlc3QuY2M=) | `99.06% <100.00%> (+<0.01%)` | :arrow_up: | ... and [3 files with indirect coverage changes](https://app.codecov.io/gh/romange/helio/pull/124/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Roman+Gershman)

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