Updated for Xcode 9.3 / Swift 4.1#7

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ktraunmueller wants to merge 3 commits intomikeash:masterfrom

ktraunmueller:master

Commits on May 8, 2018

Quiet warning about never reading from `obj` variable in `testBasics`.

mikeash
authored and
ktraunmueller
committed
Perform Xcode's recommended project settings upgrades.

mikeash
authored and
ktraunmueller
committed
updated for Xcode 9.3 / Swift 4.1
Karl Traunmüller
committed