uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/tools/networking/easyrsa/default.nix

@@ -0,0 +1,42 @@
+{ lib, stdenv, fetchFromGitHub, openssl, runtimeShell }:
+
+let
+  version = "3.0.8";
+in stdenv.mkDerivation {
+  pname = "easyrsa";
+  inherit version;
+
+  src = fetchFromGitHub {
+    owner = "OpenVPN";
+    repo = "easy-rsa";
+    rev = "v${version}";
+    sha256 = "05q60s343ydh9j6hzj0840qdcq8fkyz06q68yw4pqgqg4w68rbgs";
+  };
+
+  patches = [ ./fix-paths.patch ];
+
+  installPhase = ''
+    mkdir -p $out/share/easyrsa
+    cp -r easyrsa3/{*.cnf,x509-types,vars.example} $out/share/easyrsa
+    cp easyrsa3/openssl-easyrsa.cnf $out/share/easyrsa/safessl-easyrsa.cnf
+    install -D -m755 easyrsa3/easyrsa $out/bin/easyrsa
+    substituteInPlace $out/bin/easyrsa \
+      --subst-var out \
+      --subst-var-by openssl ${openssl.bin}/bin/openssl
+
+    # Helper utility
+    cat > $out/bin/easyrsa-init <<EOF
+    #!${runtimeShell} -e
+    cp -r $out/share/easyrsa/* .
+    EOF
+    chmod +x $out/bin/easyrsa-init
+  '';
+
+  meta = with lib; {
+    description = "Simple shell based CA utility";
+    homepage = "https://openvpn.net/";
+    license = licenses.gpl2;
+    maintainers = [ maintainers.offline maintainers.numinit ];
+    platforms = platforms.unix;
+  };
+}