Bump libc from 0.2.49 to 0.2.50 (#400)

Bumps [libc](https://github.com/rust-lang/libc) from 0.2.49 to 0.2.50.
- [Release notes](https://github.com/rust-lang/libc/releases)
- [Commits](rust-lang/libc@0.2.49...0.2.50)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot[bot]

Cargo.lock

@@ -24,7 +24,7 @@ target-lexicon = "0.2.0"
 ar = "0.6.1"
 bitflags = "1.0.3"
 byteorder = "1.2.7"
-libc = "0.2.49"
+libc = "0.2.50"
 tempfile = "3.0.7"
 env_logger = "0.6"
 gimli = { git = "https://github.com/gimli-rs/gimli.git" }