Update libc to 16f1c19

[mmatyas]

This fixes the aarch64-linux-android build (#31595).

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @nikomatsakis (or someone else) soon.

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[Nercury]

\o/

[Nercury]

I can confirm that it builds, however I was unable to link it into C library compiled with the same android arm64 toolchain. Maybe that's the next step.

[alexcrichton]

@bors: r+ 15f387d

Thanks!

[bors]

⌛ Testing commit 15f387d with merge 0ef8d42...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-mac-ios-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt