Auto merge of #1458 - jackpot51:patch-1, r=gnzlbg

Bump version to 0.2.61

Releasing a version now will allow Redox compilation to work again, as it will include #1438

Cargo.toml

 [package]
 name = "libc"
-version = "0.2.60"
+version = "0.2.61"
 authors = ["The Rust Project Developers"]
 license = "MIT OR Apache-2.0"
 readme = "README.md"