Update RPM spec file for Broccoli

I updated the spec file for the Broccoli module in order to be able to run automated builds with mock. The spec file now passes the rpmlint tests and successfully compiles and packages broccoli (with python) on EL6 platforms. This should also work for Fedora, though I haven't ran that build yet.

Things to do:

• split out language bindings to separate packages

• Fix configure scripts/cmake interface to accept standard variables for building; this enable use of the %cmake or %configure macros

See my pull request on GitHub: https://github.com/bro/broccoli/pull/1