Removing prebuilt libraries. The source code for all libraries is (and always was) available here: https://github.com/DrKLO/Telegram/tree/master/TMessagesProj/jni

Include missing unistd.h header.

On Linux unistd.h is needed for fsync().
The native library does not compile otherwise.

Thanks to https://github.com/DrKLO/Telegram/issues/738 for smart
notifications

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