Update the path of test executables

With the switch to Buster, executables in libgupnp-1.0-tests are now shipped
in a multiarch-aware path, like `/usr/lib/x86_64-linux-gnu/gupnp/` instead
of `/usr/lib/gupnp/`.

Signed-off-by: Apertis jenkins <jenkins@apertis.org>

external-binaries.cfg

-libgupnp-1.0-tests /usr/lib/gupnp/light-client
-libgupnp-1.0-tests /usr/lib/gupnp/light-server
-libgupnp-1.0-tests /usr/lib/gupnp/test-browsing
-libgupnp-1.0-tests /usr/lib/gupnp/test-introspection
+libgupnp-1.0-tests /usr/lib/*/gupnp/light-client
+libgupnp-1.0-tests /usr/lib/*/gupnp/light-server
+libgupnp-1.0-tests /usr/lib/*/gupnp/test-browsing
+libgupnp-1.0-tests /usr/lib/*/gupnp/test-introspection
 libgupnp-1.0-4 /usr/lib/x86_64-linux-gnu/libgupnp-1.0.so.4 amd64,prefix=lib
 libgupnp-1.0-4 /usr/lib/aarch64-linux-gnu/libgupnp-1.0.so.4 arm64,prefix=lib
 libgupnp-1.0-4 /usr/lib/arm-linux-gnueabihf/libgupnp-1.0.so.4 armhf,prefix=lib