Merge #1669

1669: Bump libc from 0.2.70 to 0.2.71 r=tomtau a=dependabot-preview[bot]

Bumps [libc](https://github.com/rust-lang/libc) from 0.2.70 to 0.2.71.
<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>0.2.71</h2>
<p>Bump patch version to 0.2.71</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/rust-lang/libc/commit/8712132baa9c487b229ff1489859f3ea21c70432"><code>8712132</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/rust-lang/libc/issues/1771">#1771</a> from jackpot51/patch-2</li>
<li><a href="https://github.com/rust-lang/libc/commit/8599388b587708fe4810fc06f028828ef4202be1"><code>8599388</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/rust-lang/libc/issues/1779">#1779</a> from JohnTitor/llvm-tools</li>
<li><a href="https://github.com/rust-lang/libc/commit/010663dbda571eb0cc22cffe67eb4ecbbfa183f1"><code>010663d</code></a> Add <code>llvm-tools</code> component</li>
<li><a href="https://github.com/rust-lang/libc/commit/9e9f8dd0ea5de8befd121a26662fe0710032a876"><code>9e9f8dd</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/rust-lang/libc/issues/1777">#1777</a> from JohnTitor/core-ops</li>
<li><a href="https://github.com/rust-lang/libc/commit/0c4f9be46c393f9b76f30b76ab85b310f1972cf2"><code>0c4f9be</code></a> Import <code>core::ops</code> to use <code>Range</code> syntax</li>
<li><a href="https://github.com/rust-lang/libc/commit/012444055e034e6fafd5e1e40475d1c8fa06aa5a"><code>0124440</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/rust-lang/libc/issues/1748">#1748</a> from reitermarkus/xtensa-support</li>
<li><a href="https://github.com/rust-lang/libc/commit/d791c50036f4faf64d5fa33a0ff7307ba09591ab"><code>d791c50</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/rust-lang/libc/issues/1776">#1776</a> from JohnTitor/tcp-keep</li>
<li><a href="https://github.com/rust-lang/libc/commit/967dffee510042e3dcab179d5ce6d91bd36d1d55"><code>967dffe</code></a> Add <code>TCP_KEEP{INTVL,CNT}</code> to macOS</li>
<li><a href="https://github.com/rust-lang/libc/commit/8684b554782619537aa6acadc28378293c86f96a"><code>8684b55</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/rust-lang/libc/issues/1774">#1774</a> from jabedude/sysemu</li>
<li><a href="https://github.com/rust-lang/libc/commit/1a7678933e7c7c3fb81faed9fb2a609a3c6f7783"><code>1a76789</code></a> linux: ptrace: Add definition for PTRACE_SYSEMU/_SINGLESTEP</li>
<li>Additional commits viewable in <a href="https://github.com/rust-lang/libc/compare/0.2.70...0.2.71">compare view</a></li>
</ul>
</details>
<br />


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