REVERT: #420 Google frameworks should not be embedded

#458 ios build fails in 5.2.0 and Xcode 9.2
#459 'GoogleSignIn/GoogleSignIn.h' file not found

Author: EddyVerbruggen

Diff for: package.json

@@ -1,5 +1,5 @@
 {
-  "version": "5.2.0",
+  "version": "5.2.1",
   "name": "cordova-plugin-googleplus",
   "cordova_name": "Google SignIn",
   "description": "Use your Google account to authenticate with the app.",

Diff for: plugin.xml

@@ -2,7 +2,7 @@
 <plugin xmlns="http://apache.org/cordova/ns/plugins/1.0"
         xmlns:android="http://schemas.android.com/apk/res/android"
         id="cordova-plugin-googleplus"
-        version="5.2.0">
+        version="5.2.1">
 
   <name>Google SignIn</name>
 
@@ -81,12 +81,12 @@
 
     <!-- Google frameworks -->
     <!-- Downloaded here: https://developers.google.com/identity/sign-in/ios/sdk/ (changelog: https://developers.google.com/identity/sign-in/ios/release) -->
-    <framework src="src/ios/libs/GoogleAppUtilities.framework" custom="false" />
-    <framework src="src/ios/libs/GoogleAuthUtilities.framework" custom="false" />
-    <framework src="src/ios/libs/GoogleNetworkingUtilities.framework" custom="false" />
-    <framework src="src/ios/libs/GoogleSignIn.framework" custom="false" />
-    <framework src="src/ios/libs/GoogleSymbolUtilities.framework" custom="false" />
-    <framework src="src/ios/libs/GoogleUtilities.framework" custom="false" />
+    <framework src="src/ios/libs/GoogleAppUtilities.framework" custom="true" />
+    <framework src="src/ios/libs/GoogleAuthUtilities.framework" custom="true" />
+    <framework src="src/ios/libs/GoogleNetworkingUtilities.framework" custom="true" />
+    <framework src="src/ios/libs/GoogleSignIn.framework" custom="true" />
+    <framework src="src/ios/libs/GoogleSymbolUtilities.framework" custom="true" />
+    <framework src="src/ios/libs/GoogleUtilities.framework" custom="true" />
 
     <!-- System frameworks -->
     <framework src="AddressBook.framework" weak="true" />