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/drumstick/drumstick-plugins.patch

@@ -0,0 +1,14 @@
+Make it look for its plugin in its own installation directory.
+
+Without this vmpk fails to start with "Unable to initialize all MIDI drivers".
+
+--- a/library/rt/backendmanager.cpp
++++ b/library/rt/backendmanager.cpp
+@@ -159,6 +159,7 @@ namespace rt {
+         foreach(const QString& path, QCoreApplication::libraryPaths()) {
+             d->appendDir( path + QDir::separator() + QSTR_DRUMSTICK, result );
+         }
++        d->appendDir( "@out@/lib/" + QSTR_DRUMSTICK, result );
+         return result;
+     }
+