[Fedora-packaging] Adjust old ruby guidelines to new ruby guidelines

Hi, I noticed that the old ruby guidelines[0] and the new ruby guidelines[1] use different macro names, for example gemname and gem_name. Since the old guidelines need to be used for several years in EPEL, I propose to adjust the old guidelines to the new guidlines as much as possible: - use consistent macro names - define macros provided in rubygems-devel in F17+ in spec files according to the old guidelines Are there any general objections? Otherwise I will prepare a Packaging Draft with above changes. Regards Till [0] https://fedoraproject.org/wiki/Packaging:Old_Ruby [1] https://fedoraproject.org/wiki/Packaging:Ruby