servo: Merge #13857 - Update libc to 0.2.17 (from mmatyas:libc_update); r=larsbergstrom

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Update `libc` to pick up rust-lang/libc#424.

(This is a fix for servo/servo#13154)

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<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #13154.

Source-Repo: https://github.com/servo/servo
Source-Revision: 99ad3678fa6490b83d209fd1648d49f074bb8c16

UltraBlame original commit: 77625bdc018486f929269c1375f39e34a06648ff

Author: marco-c