Auto merge of #1299 - leo60228:master, r=gnzlbg

Bump to 0.2.50

I'm using libnx-rs too, and it'd be nice to have #1278 in a release.

Cargo.toml

 [package]
 name = "libc"
-version = "0.2.49"
+version = "0.2.50"
 authors = ["The Rust Project Developers"]
 license = "MIT OR Apache-2.0"
 readme = "README.md"