ios端google；修改ios打包时pod数据源为清华

Assets/Plugins/iOS/Podfile

@@ -0,0 +1,15 @@
+source 'https://mirrors.tuna.tsinghua.edu.cn/git/CocoaPods/Specs.git'
+platform :ios, '10.0'
+
+target 'UnityFramework' do
+  pod 'FBSDKCoreKit', '~> 11.0'
+  pod 'FBSDKCoreKit_Basics', '~> 11.0'
+  pod 'FBSDKGamingServicesKit', '~> 11.0'
+  pod 'FBSDKLoginKit', '~> 11.0'
+  pod 'FBSDKShareKit', '~> 11.0'
+  pod 'Firebase/Auth'
+  pod 'GoogleSignIn'
+end
+target 'Unity-iPhone' do
+end
+use_frameworks!