android: Adjust gstreamer-1.0.mk for NDK r20
Fix NDK build with newest NDK. Cerbero itself has a separate problem trying to use r20, but this enables using the GStreamer SDK with NDK 20.
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Fix NDK build with newest NDK. Cerbero itself has a separate problem trying to use r20, but this enables using the GStreamer SDK with NDK 20.