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/development/libraries/science/math/tensorflow/prefetcher.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+# ./prefetcher.sh 2.4.0 binary-hashes.nix
+
+version="$1"
+hashfile="$2"
+rm -f $hashfile
+echo "{" >> $hashfile
+echo "version = \"$version\";" >> $hashfile
+for sys in "linux" "darwin"; do
+    for tfpref in "cpu" "gpu"; do
+        for platform in "x86_64"; do
+            if [ $sys = "darwin" ] && [ $tfpref = "gpu" ]; then
+               continue
+            fi
+            url=https://storage.googleapis.com/tensorflow/libtensorflow/libtensorflow-$tfpref-$sys-$platform-$version.tar.gz
+            hash=$(nix-prefetch-url $url)
+            echo "\"${tfpref}-${sys}-${platform}\" = {" >> $hashfile
+            echo "  url = \"$url\";" >> $hashfile
+            echo "  sha256 = \"$hash\";" >> $hashfile
+            echo "};" >> $hashfile
+        done
+    done
+done
+echo "}" >> $hashfile
+