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/build-support/fetchsvnssh/builder.sh

@@ -0,0 +1,15 @@
+source $stdenv/setup
+
+header "exporting $url (r$rev) into $out"
+
+if test "$sshSupport"; then
+    export SVN_SSH="$openssh/bin/ssh"
+fi
+
+# Pipe the "p" character into Subversion to force it to accept the
+# server's certificate.  This is perfectly safe: we don't care
+# whether the server is being spoofed --- only the cryptographic
+# hash of the output matters.
+expect -f $sshSubversion "$username" "$password" "$rev" "$url" $out
+
+stopNest

pkgs/build-support/fetchsvnssh/default.nix

@@ -0,0 +1,20 @@
+{stdenvNoCC, subversion, sshSupport ? true, openssh ? null, expect}:
+{username, password, url, rev ? "HEAD", md5 ? "", sha256 ? ""}:
+
+
+if md5 != "" then
+  throw "fetchsvnssh does not support md5 anymore, please use sha256"
+else
+stdenvNoCC.mkDerivation {
+  name = "svn-export-ssh";
+  builder = ./builder.sh;
+  nativeBuildInputs = [subversion expect];
+
+  outputHashAlgo = "sha256";
+  outputHashMode = "recursive";
+  outputHash = sha256;
+
+  sshSubversion = ./sshsubversion.exp;
+
+  inherit username password url rev sshSupport openssh;
+}

pkgs/build-support/fetchsvnssh/sshsubversion.exp

@@ -0,0 +1,22 @@
+#!/nix/var/nix/profiles/default/bin/expect -f
+
+# Set variables
+set username [lindex $argv 0]
+set password [lindex $argv 1]
+set rev [lindex $argv 2]
+set url [lindex $argv 3]
+set out [lindex $argv 4]
+set timeout -1
+
+spawn svn export -r$rev svn+ssh://$username@$url $out
+match_max 100000
+
+expect "*continue connecting*" { send -- "yes\r"; expect "*?assword:*"; send -- "$password\r" } \
+       "*?assword:*" { send -- "$password\r" }
+
+expect "*?assword:*"
+send -- "$password\r"
+
+# Send blank line
+send -- "\r"
+expect eof