check archs in dependencies when installing ports, and in case of a mismatch, upgrade/install the deps with +universal if possible, otherwise print an appropriate error message
check archs in dependencies when installing ports, and in case of a mismatch, upgrade/install the deps with +universal if possible, otherwise print an appropriate error message

git-svn-id: 620571fa9b4bd0cbce9a0cf901e91ef896adbf27@65087 d073be05-634f-4543-b044-5fe20cf6d1d6

danchr/macports-base,macports/macports-base,neverpanic/macports-base,danchr/macports-base,neverpanic/macports-base,macports/macports-base