The specific version you requested, r9 without a letter suffix, although not linked to the download page, currently seems to be obtained by taking one of the links from the current version and simply editing it to change the version number to the one you want to. However, it is not that it will continue to this day. It seems that loading in the Android hardware has been significantly reduced.
http://dl.google.com/android/ndk/android-ndk-r9-linux-x86.tar.bz2
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