Updated specfile. Works under mock for EL6

I'd like to be able to package the bro collection using spec files, rather than using the cludgy cpack approach. This still isn't quite perfect, but it is able to create the equivalent to the existing spec file.

Things To Do (I'll circle back to these once I get a "functional" bro build)
- Find cleaner way to accept the arguments from the RPM macros %configure or %cmake -- Possibly just give a warning on "unknown" arguments and massage the rest into the ./configure script
- Split package into proper broccoli, broccoli-devel, broccoli-python, broccoli-ruby packages.