*** does not contain bitcode. You must rebuild it with bitcode enabled (Xcode setting ENABLE_BITCODE), obtain an updated library from the vendor, or disable bitcode for this target. for architecture armv7
未来Watch应用须包含Bitcode，iOS不强制，但Xcode7默认会开启Bitcode。
方法一：更新library使包含Bitcode，否则会出现以下中的警告；
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(null): URGENT: all bitcode will be dropped because ‘/Users/myname/Library/Mobile Documents/com~apple~CloudDocs/foldername/appname/GoogleMobileAds.framework/GoogleMobileAds(GADSlot+AdEvents.o)‘ was built without bitcode. You must rebuild it with bitcode enabled (Xcode setting ENABLE_BITCODE), obtain an updated library the future.
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方法二：关闭Bitcode
工程设置中 buildingsetting 中搜索bitcode 选择no