pods 在Debug环境下才导入库

pod 'WoodPeckeriOS', '>= 1.0.3', :configurations => ['Debug']

参考 https://www.jianshu.com/p/5b8716ea603d

Pods / Pods.xcconfig中定义的`OTHER_LDFLAGS`  

参考 https://www.it1352.com/919066.html