What's the reasoning behind using ld64 for gccXX?

[Sean Farley]

After this change:

https://trac.macports.org/changeset/92064/

'sudo port -y install gcc4X' will now show a huge (and unnecessary) compile
chain:

For llvm-3.0: skipping org.macports.main (dry run)
For ld64: skipping org.macports.main (dry run)
For cctools: skipping org.macports.main (dry run)
For gcc4X: skipping org.macports.main (dry run)
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