Updates the README on building the FFmpeg JNI library to state that (1) Mac OS X needs --enable-memalign-hack to fix a usage of posix_memalign and (2) Linux needs --enable-decoder=mjpeg to support more video capture devices.
Updates the README on building the FFmpeg JNI library to state that (1) Mac OS X needs --enable-memalign-hack to fix a usage of posix_memalign and (2) Linux needs --enable-decoder=mjpeg to support more video capture devices.

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