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/applications/virtualization/virtualbox/qt-env-vars.patch

@@ -0,0 +1,14 @@
+--- a/src/VBox/HostDrivers/Support/SUPR3HardenedMain.cpp
++++ b/src/VBox/HostDrivers/Support/SUPR3HardenedMain.cpp
+@@ -2131,6 +2131,11 @@ static void supR3HardenedMainPurgeEnvironment(char **envp)
+         /** @todo Call NT API to do the same. */
+ #endif
+     }
++
++    /*
++     * NixOS hack: Set QT_PLUGIN_PATH to make Qt find plugins.
++     */
++    setenv("QT_PLUGIN_PATH", "@qtPluginPath@", /*overwrite=*/ 1);
+ }
+ 
+