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/build-support/setup-hooks/set-java-classpath.sh

@@ -0,0 +1,13 @@
+# This setup hook adds every JAR in the share/java subdirectories of
+# the build inputs to $CLASSPATH.
+
+export CLASSPATH
+
+addPkgToClassPath () {
+    local jar
+    for jar in $1/share/java/*.jar; do
+        export CLASSPATH=''${CLASSPATH-}''${CLASSPATH:+:}''${jar}
+    done
+}
+
+addEnvHooks "$targetOffset" addPkgToClassPath