Auto merge of #1326 - sunfishcode:bump, r=alexcrichton

Bump to 0.2.53

This adds more WASI support, and in particular adds support for WASI
being a target_os rather than a target_env, which relates to this PR:

rust-lang/rust#60117

Author: bors

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "libc"
-version = "0.2.52"
+version = "0.2.53"
 authors = ["The Rust Project Developers"]
 license = "MIT OR Apache-2.0"
 readme = "README.md"