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/applications/audio/faust/faust2csound.nix

@@ -0,0 +1,20 @@
+{ faust
+, csound
+}:
+
+faust.wrapWithBuildEnv {
+
+  baseName = "faust2csound";
+
+  propagatedBuildInputs = [
+    csound
+  ];
+
+  # faust2csound generated .cpp files have
+  #   #include "csdl.h"
+  # but that file is in the csound/ subdirectory
+  preFixup = ''
+    NIX_CFLAGS_COMPILE="$(printf '%s' "$NIX_CFLAGS_COMPILE" | sed 's%${csound}/include%${csound}/include/csound%')"
+  '';
+
+}