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/dropbear/default.nix

@@ -0,0 +1,41 @@
+{ stdenv, lib, fetchurl, glibc, zlib
+, enableStatic ? stdenv.hostPlatform.isStatic
+, sftpPath ? "/run/current-system/sw/libexec/sftp-server"
+}:
+
+stdenv.mkDerivation rec {
+  pname = "dropbear";
+  version = "2020.81";
+
+  src = fetchurl {
+    url = "https://matt.ucc.asn.au/dropbear/releases/dropbear-${version}.tar.bz2";
+    sha256 = "0fy5ma4cfc2pk25mcccc67b2mf1rnb2c06ilb7ddnxbpnc85s8s8";
+  };
+
+  dontDisableStatic = enableStatic;
+
+  configureFlags = lib.optional enableStatic "LDFLAGS=-static";
+
+  CFLAGS = "-DSFTPSERVER_PATH=\\\"${sftpPath}\\\"";
+
+  # https://www.gnu.org/software/make/manual/html_node/Libraries_002fSearch.html
+  preConfigure = ''
+    makeFlags=VPATH=`cat $NIX_CC/nix-support/orig-libc`/lib
+  '';
+
+  patches = [
+    # Allow sessions to inherit the PATH from the parent dropbear.
+    # Otherwise they only get the usual /bin:/usr/bin kind of PATH
+    ./pass-path.patch
+  ];
+
+  buildInputs = [ zlib ] ++ lib.optionals enableStatic [ glibc.static zlib.static ];
+
+  meta = with lib; {
+    homepage = "https://matt.ucc.asn.au/dropbear/dropbear.html";
+    description = "A small footprint implementation of the SSH 2 protocol";
+    license = licenses.mit;
+    maintainers = with maintainers; [ abbradar ];
+    platforms = platforms.linux;
+  };
+}