RPM Improvements for Tor

[phobos at rootme.org]

I have reworked the tor.spec.in to allow for easier rpm package
creation.  The largest change is that one can now specify target cpu.
The resulting rpm file will include the target cpu name in the rpm file.
Case in point, if you set "target_cpu=athlon", your resulting filename
may look like tor-version-release.athlon.rpm.  Previously, all rpms
would have been named i686.rpm even if the binaries are for non-i686
cpus.

This and other changes are documented in doc/tor-rpm-creation.txt.

I welcome feedback and/or patches.

Thanks!

-- 
Andrew