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/os-specific/linux/libtraceevent/default.nix

@@ -0,0 +1,37 @@
+{ lib, stdenv, fetchgit, pkg-config, asciidoc, xmlto, docbook_xml_dtd_45, docbook_xsl }:
+
+stdenv.mkDerivation rec {
+  pname = "libtraceevent";
+  version = "1.5.1";
+
+  src = fetchgit {
+    url = "git://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git";
+    rev = "libtraceevent-${version}";
+    sha256 = "sha256-g4dB8QhCG6SgZVAU3TCtb70vYYh1KN7FrcldzTGAUnI=";
+  };
+
+  # Don't build and install html documentation
+  postPatch = ''
+    sed -i -e '/^all:/ s/html//' -e '/^install:/ s/install-html//' Documentation/Makefile
+  '';
+
+  outputs = [ "out" "dev" "devman" ];
+  enableParallelBuilding = true;
+  nativeBuildInputs = [ pkg-config asciidoc xmlto docbook_xml_dtd_45 docbook_xsl ];
+  makeFlags = [
+    "prefix=${placeholder "out"}"
+    "doc"                       # build docs
+  ];
+  installFlags = [
+    "pkgconfig_dir=${placeholder "out"}/lib/pkgconfig"
+    "doc-install"
+  ];
+
+  meta = with lib; {
+    description = "Linux kernel trace event library";
+    homepage    = "https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/";
+    license     = licenses.lgpl21Only;
+    platforms   = platforms.linux;
+    maintainers = with maintainers; [ wentasah ];
+  };
+}