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/development/libraries/libunwind/default.nix

@@ -0,0 +1,52 @@
+{ stdenv, lib, fetchurl, fetchpatch, autoreconfHook, xz, buildPackages }:
+
+stdenv.mkDerivation rec {
+  pname = "libunwind";
+  version = "1.6.2";
+
+  src = fetchurl {
+    url = "mirror://savannah/libunwind/${pname}-${version}.tar.gz";
+    sha256 = "sha256-SmrsZmmR+0XQiJxErt6K1usQgHHDVU/N/2cfnJR5SXY=";
+  };
+
+  patches = [
+    # Fix for aarch64 and non-4K pages. Remove once upgraded past 1.6.2.
+    (fetchpatch {
+      url = "https://github.com/libunwind/libunwind/commit/e85b65cec757ef589f28957d0c6c21c498a03bdf.patch";
+      sha256 = "1lnlygvhqrdrjgw303pg2k2k4ms4gaghpjsgmhk47q83vy1yjwfg";
+    })
+  ];
+
+  postPatch = if stdenv.cc.isClang then ''
+    substituteInPlace configure.ac --replace "-lgcc_s" ""
+  '' else lib.optionalString stdenv.hostPlatform.isMusl ''
+    substituteInPlace configure.ac --replace "-lgcc_s" "-lgcc_eh"
+  '';
+
+  nativeBuildInputs = [ autoreconfHook ];
+
+  outputs = [ "out" "dev" "devman" ];
+
+  # Without latex2man, no man pages are installed despite being
+  # prebuilt in the source tarball.
+  configureFlags = [ "LATEX2MAN=${buildPackages.coreutils}/bin/true" ];
+
+  propagatedBuildInputs = [ xz ];
+
+  postInstall = ''
+    find $out -name \*.la | while read file; do
+      sed -i 's,-llzma,${xz.out}/lib/liblzma.la,' $file
+    done
+  '';
+
+  doCheck = false; # fails
+
+  meta = with lib; {
+    homepage = "https://www.nongnu.org/libunwind";
+    description = "A portable and efficient API to determine the call-chain of a program";
+    maintainers = with maintainers; [ orivej ];
+    platforms = platforms.linux;
+    badPlatforms = [ "riscv32-linux" ];
+    license = licenses.mit;
+  };
+}