Update README to mention autogen.sh
The top level README file in Tor's source code repo says: `To build Tor from [`](`) ` ./configure && make && make install` These instructions are outdated and do not work on the current repo (the configure script does not exist). The instructions should instead say: `To build Tor from [`](`) ` ./autogen.sh && make && make install` **Trac**: **Username**: bestchai
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