Adapt to XCode 9.1 and suppress some warning#15

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flyfish30 wants to merge 2 commits intomchakravarty:masterfrom

flyfish30:master

Commits on Nov 3, 2017

Add header search path for GHC in Xcode project file
flyfish30
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Commits on Nov 17, 2017

suppress the warning of possible misuse of comma operator
flyfish30
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