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/perf-tools/default.nix

@@ -0,0 +1,45 @@
+{ lib, stdenv, fetchFromGitHub, perl }:
+
+stdenv.mkDerivation {
+  pname = "perf-tools";
+  version = "unstable-2017-12-19";
+
+  src = fetchFromGitHub {
+    owner = "brendangregg";
+    repo = "perf-tools";
+    rev = "98d42a2a1493d2d1c651a5c396e015d4f082eb20";
+    sha256 = "09qnss9pd4kr6qadvp62m2g8sfrj86fksi1rr8m8w4314pzfb93c";
+  };
+
+  buildInputs = [ perl ];
+
+  patchPhase =
+    ''
+      for i in execsnoop iolatency iosnoop kernel/funcslower killsnoop opensnoop; do
+        substituteInPlace $i \
+          --replace /usr/bin/gawk "$(type -p gawk)" \
+          --replace /usr/bin/mawk /no-such-path \
+          --replace /usr/bin/getconf "$(type -p getconf)" \
+          --replace awk=awk "awk=$(type -p gawk)"
+      done
+
+      rm -rf examples deprecated
+    '';
+
+  installPhase =
+    ''
+      d=$out/libexec/perf-tools
+      mkdir -p $d $out/share
+      cp -prvd . $d/
+      ln -s $d/bin $out/bin
+      mv $d/man $out/share/
+    '';
+
+  meta = with lib; {
+    platforms = platforms.linux;
+    homepage = "https://github.com/brendangregg/perf-tools";
+    description = "Performance analysis tools based on Linux perf_events (aka perf) and ftrace";
+    maintainers = [ maintainers.eelco ];
+    license = licenses.gpl2Plus;
+  };
+}