compile-time exclusive access for Test scheme

CryptoSwift.xcodeproj/project.pbxproj

@@ -949,6 +949,7 @@
 				PRODUCT_NAME = CryptoSwift;
 				SKIP_INSTALL = YES;
 				SWIFT_DISABLE_SAFETY_CHECKS = YES;
+				SWIFT_ENFORCE_EXCLUSIVE_ACCESS = "compile-time";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				SWIFT_VERSION = 4.0;
 				TVOS_DEPLOYMENT_TARGET = 9.0;