* perl, texinfo-7: provide a secondaryArch package
LilyPond requires a newer texinfo than the 6.1 that is available for x86_gcc2.
Provide a secondary architecture version of texinfo 7 to fix that.
Perl (secondary) is required for texinfo.
* texinfo-7: remove libtool files
* texinfo-7: add conflict between primary and secondary packages
They largely contain the same data files and documentation.