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/filesystems/s3backer/default.nix

@@ -0,0 +1,36 @@
+{ lib, stdenv, fetchFromGitHub
+, autoreconfHook, pkg-config
+, fuse, curl, expat }:
+
+stdenv.mkDerivation rec {
+  pname = "s3backer";
+  version = "1.6.3";
+
+  src = fetchFromGitHub {
+    sha256 = "sha256-DOf+kpflDd2U1nXDLKYts/yf121CrBFIBI47OQa5XBs=";
+    rev = version;
+    repo = "s3backer";
+    owner = "archiecobbs";
+  };
+
+  nativeBuildInputs = [ autoreconfHook pkg-config ];
+  buildInputs = [ fuse curl expat ];
+
+  # AC_CHECK_DECLS doesn't work with clang
+  postPatch = lib.optionalString stdenv.cc.isClang ''
+    substituteInPlace configure.ac --replace \
+      'AC_CHECK_DECLS(fdatasync)' ""
+  '';
+
+  autoreconfPhase = ''
+    patchShebangs ./autogen.sh
+    ./autogen.sh
+  '';
+
+  meta = with lib; {
+    homepage = "https://github.com/archiecobbs/s3backer";
+    description = "FUSE-based single file backing store via Amazon S3";
+    license = licenses.gpl2Plus;
+    platforms = platforms.unix;
+  };
+}