Merge #50

50: Bump libc from 0.2.81 to 0.2.88 r=jmesmon a=dependabot[bot]

Bumps [libc](https://github.com/rust-lang/libc) from 0.2.81 to 0.2.88.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/rust-lang/libc/releases">libc's releases</a>.</em></p>
<blockquote>
<h2>0.2.88</h2>
<p>Bump patch version to 0.2.88.</p>
<h2>0.2.87</h2>
<p>Bump patch version to 0.2.87.</p>
<h2>0.2.86</h2>
<p>Bump patch version to 0.2.86.</p>
<h2>0.2.82</h2>
<p>Bump patch version to 0.2.82.</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/rust-lang/libc/commit/fc51a0f327ba148ffc1e6a11b7448f649b80608a"><code>fc51a0f</code></a> Auto merge of <a href="https://github.com/rust-lang/libc/issues/2103">#2103</a> - JohnTitor:version-bump, r=JohnTitor</li>
<li><a href="https://github.com/rust-lang/libc/commit/9abcbd15de9f281feea0a419e833958623a664f0"><code>9abcbd1</code></a> Bump up libc version to 0.2.88</li>
<li><a href="https://github.com/rust-lang/libc/commit/990afbb5adf9d6fd8d81202c7613f422ee61cf45"><code>990afbb</code></a> Auto merge of <a href="https://github.com/rust-lang/libc/issues/2102">#2102</a> - de-vri-es:linux-arm32-accept4, r=JohnTitor</li>
<li><a href="https://github.com/rust-lang/libc/commit/b98d5292b8cfe96213503997d9cd1f3f49bfce40"><code>b98d529</code></a> Re-add accept4 for Android on 32 bit ARM.</li>
<li><a href="https://github.com/rust-lang/libc/commit/3a7135f491b8faac564c13e7d0c5fd6b10e03855"><code>3a7135f</code></a> Auto merge of <a href="https://github.com/rust-lang/libc/issues/2100">#2100</a> - TheDoctor314:gettid, r=JohnTitor</li>
<li><a href="https://github.com/rust-lang/libc/commit/b719be41508f18b7abd7b521b7f555773c02d1fe"><code>b719be4</code></a> Skip tests for <code>gettid</code> on musl</li>
<li><a href="https://github.com/rust-lang/libc/commit/2de2cb74c82cde76a6b75ade8cf7e539052c7e2b"><code>2de2cb7</code></a> Add gettid() for Linux and Android</li>
<li><a href="https://github.com/rust-lang/libc/commit/ec86e5fb3258a844ece771d2c6f0fbf152086eab"><code>ec86e5f</code></a> Auto merge of <a href="https://github.com/rust-lang/libc/issues/2097">#2097</a> - cmusser:topic/dfly-waitid, r=JohnTitor</li>
<li><a href="https://github.com/rust-lang/libc/commit/c334f98ad97fdaa28f431b0c439686eef1048f3f"><code>c334f98</code></a> dragonflybsd: expose waitid() prototype + related constants</li>
<li><a href="https://github.com/rust-lang/libc/commit/6b1e6a2a72488481034fc2e1b409f379f96fd8f1"><code>6b1e6a2</code></a> Auto merge of <a href="https://github.com/rust-lang/libc/issues/2099">#2099</a> - JohnTitor:fix-doc-links, r=JohnTitor</li>
<li>Additional commits viewable in <a href="https://github.com/rust-lang/libc/compare/0.2.81...0.2.88">compare view</a></li>
</ul>
</details>
<br />


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