Expand OS X versions referenced in configure message #25198
                
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Tiny tiny nitpick that I just noticed after getting a new laptop ( 🍺 + 💻 = 👼 ) and thus needing to ./configure anew on Yosemite.
It's weird to see a message that says you're on 10.9 if you're on 10.10, in a oh-i-wonder-what-else-is-wrong sort of sense-- easy fix with a
>=sincegcc --versionon 10.10 with the newest xcode still says it's clang.❤️