Merge pull request #1420 from deltachat/optimize-for-speed

enable speed optimisation also for debug builds

DcCore/DcCore.xcodeproj/project.pbxproj

@@ -412,7 +412,7 @@
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
-				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};