[iOS] Fix: library symbols stripped on release

For debug, a dummy call to any function in the library was enough; on
release, ALL need to be dummy-called.

bindings/dart/ios/Classes/SwiftOuisyncPlugin.swift

@@ -14,6 +14,39 @@ public class SwiftOuisyncPlugin: NSObject, FlutterPlugin {
 
   public func dummyMethodToEnforceBundling() {
     // This will never be executed
-    session_close()
+
+    let session: SessionHandle = 0
+    let port: Int64 = 0
+    let pointer: Int64 = 0
+    let function: PostDartCObjectFn? = nil
+    let payload: UnsafeMutablePointer<UInt8>? = nil
+    let length: UInt64 = 0
+    let handle: UInt64 = 0
+    let stringPointer: UnsafeMutablePointer<Int>? = nil
+    let level: UInt8 = 0
+
+    let resultCreate = session_create_dart("", "", function, port)
+    print(resultCreate)
+
+    let resultClose = session_close(session)
+    print(resultClose)
+
+    let resultSend = session_channel_send(session, payload, length)
+    print(resultSend)
+
+    let resultShutdown = session_shutdown_network_and_close(session)
+    print(resultShutdown)
+
+    let resultFileCopy = file_copy_to_raw_fd_dart(session, handle, 0, function, port)
+    print(resultFileCopy)
+
+    let resultFileCopy2 = file_copy_to_raw_fd_dart(session, handle, 0, function, port)
+    print(resultFileCopy2)
+
+    let resultFreeString = free_string(stringPointer)
+    print(resultFreeString)
+
+    let resultLogPrint = log_print(level, "", "")
+    print(resultLogPrint)
   }
 }