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ios build: Fix Xcode project settings warnings.

Pulled these changes from RN v0.57, specifically commit
facebook/react-native@c298e0ae0 .

Updating LastUpgradeCheck assures Xcode 9 that we've seen and
acknowledged its warnings to "Update to recommended settings",
like these:
https://user-images.githubusercontent.com/5353594/41173274-1a4fbb3e-6b0b-11e8-973b-8290794a4f8b.png

The other changes correspond to those recommended settings.  We have
some of the settings enabled already, thus producing fewer changes
than in RN's commit.

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