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/slib/setup-hook.sh

@@ -0,0 +1,13 @@
+addSlibPath () {
+    if test -f "$1/lib/slib/slibcat"
+    then
+        export SCHEME_LIBRARY_PATH="$1/lib/slib/"
+        echo "SLIB found in \`$1'; setting \$SCHEME_LIBRARY_PATH to \`$SCHEME_LIBRARY_PATH'"
+
+        # This is needed so that `(load-from-path "slib/guile.init")' works.
+        export GUILE_LOAD_PATH="$1/lib:$GUILE_LOAD_PATH"
+        echo "SLIB: setting \$GUILE_LOAD_PATH to \`$GUILE_LOAD_PATH'"
+    fi
+}
+
+addEnvHooks "$hostOffset" addSlibPath