Install NDK to strip native libraries

Merged akwizgran requested to merge install-ndk-bundle into master

This branch installs the NDK bundle to strip "native libraries" (which are actually the Tor and obfs4proxy binaries). The binaries have already been stripped, but if the NDK bundle is installed they're stripped again, which slightly modifies them. Since the NDK bundle is installed on the build box, we also need to install it on the reproducer.

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