iOS: disable logging in release mode

Change-Id: Ie0fe62aa69589359e72c849d315ab5c58b98774a
diff --git a/Ring/Ring.xcodeproj/project.pbxproj b/Ring/Ring.xcodeproj/project.pbxproj
index 2d7e7bc..ff23b93 100644
--- a/Ring/Ring.xcodeproj/project.pbxproj
+++ b/Ring/Ring.xcodeproj/project.pbxproj
@@ -2290,6 +2290,7 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
@@ -2549,6 +2550,7 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";