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/fetchsvn/builder.sh

@@ -0,0 +1,25 @@
+source $stdenv/setup
+
+header "exporting $url (r$rev) into $out"
+
+if test -n "$http_proxy"; then
+    # Configure proxy
+    mkdir .subversion
+    proxy="${http_proxy#*://}"
+
+    echo '[global]' > .subversion/servers
+    echo "http-proxy-host = ${proxy%:*}" >> .subversion/servers
+    echo "http-proxy-port = ${proxy##*:}" >> .subversion/servers
+
+    export HOME="$PWD"
+fi;
+
+if test -z "$LC_ALL"; then
+    export LC_ALL="en_US.UTF-8"
+fi;
+
+svn export --trust-server-cert --non-interactive \
+    ${ignoreExternals:+--ignore-externals} ${ignoreKeywords:+--ignore-keywords} \
+    -r "$rev" "$url" "$out"
+
+stopNest