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/audio/trx/add_bctoolbox_ldlib.patch

@@ -0,0 +1,15 @@
+diff --git a/Makefile b/Makefile
+index ffcd883..c4b4ff7 100644
+--- a/Makefile
++++ b/Makefile
+@@ -12,8 +12,9 @@ CFLAGS += -MMD -Wall
+ LDLIBS_ASOUND ?= -lasound
+ LDLIBS_OPUS ?= -lopus
+ LDLIBS_ORTP ?= -lortp
++LDLIBS_BCTOOLBOX ?= -lbctoolbox
+ 
+-LDLIBS += $(LDLIBS_ASOUND) $(LDLIBS_OPUS) $(LDLIBS_ORTP)
++LDLIBS += $(LDLIBS_ASOUND) $(LDLIBS_OPUS) $(LDLIBS_ORTP) $(LDLIBS_BCTOOLBOX)
+ 
+ .PHONY:		all install dist clean
+ 

pkgs/tools/audio/trx/default.nix

@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchurl, alsa-lib, libopus, ortp, bctoolbox }:
+
+stdenv.mkDerivation rec {
+  pname = "trx";
+  version = "0.5";
+
+  src = fetchurl {
+    url = "https://www.pogo.org.uk/~mark/trx/releases/${pname}-${version}.tar.gz";
+    sha256 = "1jjgca92nifjhcr3n0fmpfr6f5gxlqyal2wmgdlgd7hx834r1if7";
+  };
+
+  # Makefile is currently missing -lbctoolbox so the build fails when linking
+  # the libraries. This patch adds that flag.
+  patches = [
+    ./add_bctoolbox_ldlib.patch
+  ];
+
+  buildInputs = [ alsa-lib libopus ortp bctoolbox ];
+  makeFlags = [ "PREFIX=$(out)" ];
+
+  meta = with lib; {
+    description = "A simple toolset for broadcasting live audio using RTP/UDP and Opus";
+    homepage = "http://www.pogo.org.uk/~mark/trx/";
+    license = licenses.gpl2;
+    maintainers = [ maintainers.hansjoergschurr ];
+    platforms = platforms.linux;
+  };
+}