Auto merge of rust-lang#1323 - jackpot51:patch-1, r=gnzlbg

Bump to 0.2.52

This will allow the crt-static feature to be utilized correctly on Redox, rust-lang#1322

Author: bors

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "libc"
-version = "0.2.51"
+version = "0.2.52"
 authors = ["The Rust Project Developers"]
 license = "MIT OR Apache-2.0"
 readme = "README.md"