Update nitrokey crate to 0.4.0

This change finally updates the version of the nitrokey crate that we
consume to 0.4.0. Along with that we update rand_core, one of its
dependencies, to 0.5.1. Further more we add cfg-if in version 0.1.10 and
getrandom in version 0.1.13, both of which are now new (non-development)
dependencies.

Import subrepo nitrokey/:nitrokey at e81057037e9b4f370b64c0a030a725bc6bdfb870
Import subrepo cfg-if/:cfg-if at 4484a6faf816ff8058088ad857b0c6bb2f4b02b2
Import subrepo getrandom/:getrandom at d661aa7e1b8cc80b47dabe3d2135b3b47d2858af
Import subrepo rand/:rand at d877ed528248b52d947e0484364a4e1ae59ca502

1 files changed, 0 insertions, 7 deletions

diff --git a/rand/rand_chacha/build.rs b/rand/rand_chacha/build.rs
deleted file mode 100644
index 06e12a4..0000000
--- a/rand/rand_chacha/build.rs
+++ /dev/null
@@ -1,7 +0,0 @@
-extern crate autocfg;
-
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-    let ac = autocfg::new();
-    ac.emit_rustc_version(1, 26);
-}