Update Cargo.toml

Author: Dylan-DPC

varlink-cli/Cargo.toml

@@ -23,5 +23,5 @@ serde_json = "1.0.41"
 clap = "2.33.0"
 colored_json = "2.1.0"
 chainerror = "0.7.0"
-libc = { version = "0", default-features = false }
+libc = { version = "0.2.126", default-features = false }
 bitflags = "1.2.1"