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/science/misc/openmodelica/omlibrary/fakegit.nix

@@ -0,0 +1,49 @@
+{ lib, stdenv, fetchgit, bash }:
+let
+  mkscript = path: text: ''
+    mkdir -pv `dirname ${path}`
+    cat > ${path} <<"EOF"
+    #!${bash}/bin/bash
+    ME=$(basename ${path})
+    ${text}
+    EOF
+    sed -i "s@%out@$out@g" ${path}
+    chmod +x ${path}
+  '';
+
+  hashname = r:
+    let
+      rpl = lib.replaceChars [ ":" "/" ] [ "_" "_" ];
+    in
+    (rpl r.url) + "-" + (rpl r.rev);
+
+in
+stdenv.mkDerivation {
+  name = "fakegit";
+
+  buildCommand = ''
+    mkdir -pv $out/repos
+    ${lib.concatMapStrings
+      (r: "cp -r ${fetchgit r} $out/repos/${hashname r}\n")
+      (import ./src-libs.nix)}
+
+    ${mkscript "$out/bin/checkout-git.sh" ''
+      if test "$#" -ne 4; then
+        echo "Usage: $0 DESTINATION URL GITBRANCH HASH"
+        exit 1
+      fi
+      DEST=$1
+      URL=`echo $2 | tr :/ __`
+      GITBRANCH=$3
+      REVISION=$4
+
+      REVISION=`echo $REVISION | tr :/ __`
+
+      rm -rf $DEST
+      mkdir -pv $DEST
+      echo "FAKEGIT cp -r %out/repos/$URL-$REVISION $DEST" >&2
+      cp -r %out/repos/$URL-$REVISION/* $DEST
+      chmod u+w -R $DEST
+    ''}
+  '';
+}