Compiling tor on master (2bfb76b9) breaks on Android

Our nightly Android builds are busted:

  AR       libtor.a
clang: error: no such file or directory:
'/var/tmp/dist/libevent/lib/.libs/libevent.a'

I suspect that's due to @dgoulet's c618c4f2. I am not sure whether we are supposed to adapt things in Tor Browser land instead of whether the change is an actual tor issue. If the former, please move the ticket to our tor-browser-build repo.

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