Remove unused patches

Cargo.lock

@@ -21,16 +21,6 @@ dependencies = [
  "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[patch.unused]]
-name = "atty"
-version = "0.2.11"
-source = "git+https://gitlab.redox-os.org/redox-os/atty.git?branch=redox-unix#a30c9539940d0148b86f9491c03eb2af450cd62e"
-
-[[patch.unused]]
-name = "libc"
-version = "0.2.54"
-source = "git+https://gitlab.redox-os.org/redox-os/liblibc.git?branch=redox-unix#eb75c489172e10bfcb57ca679ff337827cf783a9"
-
 [metadata]
 "checksum redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)" = "12229c14a0f65c4f1cb046a3b52047cdd9da1f4b30f8a39c5063c8bae515e252"
 "checksum redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7e891cfe48e9100a70a3b6eb652fef28920c117d366339687bd5576160db0f76"

Cargo.toml

@@ -9,7 +9,3 @@ edition = "2018"
 [dependencies]
 redox_syscall = "0.1"
 redox_termios = "0.1"
-
-[patch.crates-io]
-atty = { git = "https://gitlab.redox-os.org/redox-os/atty.git", branch = "redox-unix" }
-libc = { git = "https://gitlab.redox-os.org/redox-os/liblibc.git", branch = "redox-unix" }