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/version-management/tkrev/default.nix

@@ -0,0 +1,31 @@
+{ lib, stdenv, fetchurl, tcl, tk }:
+
+stdenv.mkDerivation rec {
+  pname = "tkrev";
+  version = "9.4.1";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/tkcvs/tkrev_${version}.tar.gz";
+    sha256 = "sha256-WHDZPShEB9Q+Bjbb37mogJLUZk2GuWoO8bz+Zydc7i4=";
+  };
+
+  buildInputs = [ tcl tk ];
+
+  patchPhase = ''
+    for file in tkrev/tkrev.tcl tkdiff/tkdiff; do
+        substituteInPlace "$file" \
+            --replace "exec wish" "exec ${tk}/bin/wish"
+    done
+  '';
+
+  installPhase = ''
+    ./doinstall.tcl $out
+  '';
+
+  meta = {
+    homepage = "https://tkcvs.sourceforge.io";
+    description = "TCL/TK GUI for cvs and subversion";
+    license = lib.licenses.gpl2Plus;
+    platforms = lib.platforms.unix;
+  };
+}